The compile_bracket_matchingpath function in pcre_jit_compile.c in PCRE through 8.x before revision 1680 (e.g., the PHP 7.1.1 bundled version) allows remote attackers to cause a denial of service (out-of-bounds read and application crash) via a crafted regular expression.

The remote Redhat Enterprise Linux 7 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - pcre: inefficient posix character class syntax check (8.38/16) (CVE-2015-8391)

  - pcre: Integer overflow caused by missing check for certain conditions (8.38/31) (CVE-2015-8394)

  - PCRE before 8.36 mishandles the /(((a\2)|(a*)\g<-1>))*/ pattern and related patterns with certain internal     recursive back references, which allows remote attackers to cause a denial of service (segmentation fault)     or possibly have unspecified other impact via a crafted regular expression, as demonstrated by a     JavaScript RegExp object encountered by Konqueror. (CVE-2015-2327)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

This plugin has been deprecated as it does not adhere to established standards for this style of check.

The remote Ubuntu 16.04 ESM host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5665-1 advisory.

    It was discovered that PCRE incorrectly handled certain regular expressions. A remote attacker could use     this issue to cause applications using PCRE to crash, resulting in a denial of service. (CVE-2017-6004)

    It was discovered that PCRE incorrectly handled certain Unicode encoding. A remote attacker could use this     issue to cause applications using PCRE to crash, resulting in a denial of service. (CVE-2017-7186)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED12 / SLES12 / SLES_SAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3652-1 advisory.

  - The compile_bracket_matchingpath function in pcre_jit_compile.c in PCRE through 8.x before revision 1680     (e.g., the PHP 7.1.1 bundled version) allows remote attackers to cause a denial of service (out-of-bounds     read and application crash) via a crafted regular expression. (CVE-2017-6004)

  - libpcre1 in PCRE 8.40 and libpcre2 in PCRE2 10.23 allow remote attackers to cause a denial of service     (segmentation violation for read access, and application crash) by triggering an invalid Unicode property     lookup. (CVE-2017-7186)

  - The _pcre32_xclass function in pcre_xclass.c in libpcre1 in PCRE 8.40 allows remote attackers to cause a     denial of service (invalid memory read) via a crafted file. (CVE-2017-7244)

  - Stack-based buffer overflow in the pcre32_copy_substring function in pcre_get.c in libpcre1 in PCRE 8.40     allows remote attackers to cause a denial of service (WRITE of size 4) or possibly have unspecified other     impact via a crafted file. (CVE-2017-7245)

  - Stack-based buffer overflow in the pcre32_copy_substring function in pcre_get.c in libpcre1 in PCRE 8.40     allows remote attackers to cause a denial of service (WRITE of size 268) or possibly have unspecified     other impact via a crafted file. (CVE-2017-7246)

  - libpcre in PCRE before 8.43 allows a subject buffer over-read in JIT when UTF is disabled, and \X or \R     has more than one fixed quantifier, a related issue to CVE-2019-20454. (CVE-2019-20838)

  - libpcre in PCRE before 8.44 allows an integer overflow via a large number after a (?C substring.
    (CVE-2020-14155)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to its banner, the version of PHP running on the remote web server is 7.0.x prior to 7.0.21. It is, therefore, affected by the following vulnerabilities :

 - An out-of-bounds read error exists in the PCRE library in the compile_bracket_matchingpath() function within file pcre_jit_compile.c. An unauthenticated, remote attacker can exploit this, via a specially crafted regular expression, to crash a process linked to the library, resulting in a denial of service condition. (CVE-2017-6004)

 - An out-of-bounds read error exists in the GD Graphics Library (LibGD) in the gdImageCreateFromGifCtx() function within file gd_gif_in.c when handling a specially crafted GIF file. An unauthenticated, remote attacker can exploit this to disclose sensitive memory contents or crash a process linked to the library. (CVE-2017-7890)

 - An out-of-bounds read error exists in Oniguruma in the match_at() function within file regexec.c. An unauthenticated, remote attacker can exploit this to disclose sensitive memory contents or crash a process linked to the library. (CVE-2017-9224)

 - An out-of-bounds write error exists in Oniguruma in the next_state_val() function during regular expression compilation. An unauthenticated, remote attacker can exploit this to execute arbitrary code. (CVE-2017-9226)

 - An out-of-bounds read error exists in Oniguruma in the mbc_enc_len() function within file utf8.c. An unauthenticated, remote attacker can exploit this to disclose memory contents or crash a process linked to the library. (CVE-2017-9227)

 - An out-of-bounds write error exists in Oniguruma in the bitset_set_range() function during regular expression compilation. An unauthenticated, remote attacker can exploit this to execute arbitrary code. (CVE-2017-9228)

 - An invalid pointer deference flaw exists in Oniguruma in the left_adjust_char_head() function within file regexec.c during regular expression compilation. An unauthenticated, remote attacker can exploit this to crash a process linked to the library, resulting in a denial of service condition. (CVE-2017-9229)

 - A flaw exists in OpenSSL in the EVP_SealInit() function within file crypto/evp/p_seal.c due to returning an undocumented value of '-1'. An unauthenticated, remote attacker can exploit this to cause an unspecified impact. (CVE-2017-11144)

 - An out-of-bounds read error exists in PHP in the php_parse_date() function within file ext/date/lib/parse_date.c. An unauthenticated, remote attacker can exploit this to disclose memory contents or cause a denial of service condition. (CVE-2017-11145)

 - A use-after-free error exists in PHP in the zval_get_type() function within file ext/standard/var_unserializer.c. An unauthenticated, remote attacker can exploit this to execute arbitrary code.

 - An out-of-bounds read error exists in PHP in the finish_nested_data() function within file ext/standard/var_unserializer.re. An unauthenticated, remote attacker can exploit this to disclose memory contents or cause a denial of service condition.

 - An off-by-one overflow condition exists in PHP in the INI parsing API, specifically in the zend_ini_do_op() function within file Zend/zend_ini_parser.y, due to improper validation of user-supplied input. An unauthenticated, remote attacker can exploit this to cause a denial of service condition or the execution of arbitrary code.

 - A stack-based buffer overflow condition exists in PHP in the msgfmt_parse_message() function due to improper validation of user-supplied input when parsing locale. An unauthenticated, remote attacker can exploit this to cause a denial of service condition or the execution of arbitrary code.

Note that the scanner has not tested for these issues but has instead relied only on the application's self-reported version number.

According to its banner, the version of PHP running on the remote web server is 5.6.x prior to 5.6.31. It is, therefore, affected by the following vulnerabilities :

 - An out-of-bounds read error exists in the PCRE library in the compile_bracket_matchingpath() function within file pcre_jit_compile.c. An unauthenticated, remote attacker can exploit this, via a specially crafted regular expression, to crash a process linked to the library, resulting in a denial of service condition. (CVE-2017-6004)

 - An out-of-bounds read error exists in the GD Graphics Library (LibGD) in the gdImageCreateFromGifCtx() function within file gd_gif_in.c when handling a specially crafted GIF file. An unauthenticated, remote attacker can exploit this to disclose sensitive memory contents or crash a process linked to the library. (CVE-2017-7890)

 - An out-of-bounds read error exists in Oniguruma in the match_at() function within file regexec.c. An unauthenticated, remote attacker can exploit this to disclose sensitive memory contents or crash a process linked to the library. (CVE-2017-9224)

 - An out-of-bounds write error exists in Oniguruma in the next_state_val() function during regular expression compilation. An unauthenticated, remote attacker can exploit this to execute arbitrary code. (CVE-2017-9226)

 - An out-of-bounds read error exists in Oniguruma in the mbc_enc_len() function within file utf8.c. An unauthenticated, remote attacker can exploit this to disclose memory contents or crash a process linked to the library. (CVE-2017-9227)

 - An out-of-bounds write error exists in Oniguruma in the bitset_set_range() function during regular expression compilation. An unauthenticated, remote attacker can exploit this to execute arbitrary code. (CVE-2017-9228)

 - An invalid pointer deference flaw exists in Oniguruma in the left_adjust_char_head() function within file regexec.c during regular expression compilation. An unauthenticated, remote attacker can exploit this to crash a process linked to the library, resulting in a denial of service condition. (CVE-2017-9229)

 - A denial of service condition exists in PHP when handling overlarge POST requests. An unauthenticated, remote attacker can exploit this to exhaust available CPU resources. (CVE-2017-11142)

 - An extended invalid free error exists in PHP in the php_wddx_push_element() function within file ext/wddx/wddx.c when parsing empty boolean tags. An unauthenticated, remote attacker can exploit this to cause a denial of service condition. (CVE-2017-11143)

 - A flaw exists in OpenSSL in the EVP_SealInit() function within file crypto/evp/p_seal.c due to returning an undocumented value of '-1'. An unauthenticated, remote attacker can exploit this to cause an unspecified impact. (CVE-2017-11144)

 - An out-of-bounds read error exists in PHP in the php_parse_date() function within file ext/date/lib/parse_date.c. An unauthenticated, remote attacker can exploit this to disclose memory contents or cause a denial of service condition. (CVE-2017-11145)

 - An out-of-bounds read error exists in PHP in the finish_nested_data() function within file ext/standard/var_unserializer.re. An unauthenticated, remote attacker can exploit this to disclose memory contents or cause a denial of service condition.

 - An off-by-one overflow condition exists in PHP in the INI parsing API, specifically in the zend_ini_do_op() function within file Zend/zend_ini_parser.y, due to improper validation of user-supplied input. An unauthenticated, remote attacker can exploit this to cause a denial of service condition or the execution of arbitrary code.

Note that the scanner has not attempted to exploit this issue but has instead relied only on the application's self-reported version number.

The Tenable SecurityCenter application installed on the remote host is missing a security patch. It is, therefore, affected by multiple vulnerabilities in the bundled version of PHP :

  - An out-of-bounds read error exists in the PCRE library     in the compile_bracket_matchingpath() function within     file pcre_jit_compile.c. An unauthenticated, remote     attacker can exploit this, via a specially crafted     regular expression, to crash a process linked to the     library, resulting in a denial of service condition.
    (CVE-2017-6004)

  - An out-of-bounds read error exists in the GD Graphics     Library (LibGD) in the gdImageCreateFromGifCtx()     function within file gd_gif_in.c when handling a     specially crafted GIF file. An unauthenticated, remote     attacker can exploit this to disclose sensitive memory     contents or crash a process linked to the library.
    (CVE-2017-7890)

  - An out-of-bounds read error exists in Oniguruma in the     match_at() function within file regexec.c. An     unauthenticated, remote attacker can exploit this to     disclose sensitive memory contents or crash a process     linked to the library. (CVE-2017-9224)

  - An out-of-bounds write error exists in Oniguruma in the     next_state_val() function during regular expression     compilation. An unauthenticated, remote attacker can     exploit this to execute arbitrary code. (CVE-2017-9226)

  - An out-of-bounds read error exists in Oniguruma in the     mbc_enc_len() function within file utf8.c. An     unauthenticated, remote attacker can exploit this to     disclose memory contents or crash a process linked to     the library. (CVE-2017-9227)

  - An out-of-bounds write error exists in Oniguruma in the     bitset_set_range() function during regular expression     compilation. An unauthenticated, remote attacker can     exploit this to execute arbitrary code. (CVE-2017-9228)

  - An invalid pointer deference flaw exists in Oniguruma     in the left_adjust_char_head() function within file     regexec.c during regular expression compilation. An     unauthenticated, remote attacker can exploit this to     crash a process linked to the library, resulting in a     denial of service condition. (CVE-2017-9229)

  - A denial of service condition exists in PHP when     handling overlarge POST requests. An unauthenticated,     remote attacker can exploit this to exhaust available     CPU resources. (CVE-2017-11142)

  - An extended invalid free error exists in PHP in the     php_wddx_push_element() function within file     ext/wddx/wddx.c when parsing empty boolean tags.
    An unauthenticated, remote attacker can exploit this to     cause a denial of service condition. (CVE-2017-11143)

  - A flaw exists in OpenSSL in the EVP_SealInit() function     within file crypto/evp/p_seal.c due to returning an     undocumented value of '-1'. An unauthenticated, remote     attacker can exploit this to cause an unspecified     impact. (CVE-2017-11144)

  - An out-of-bounds read error exists in PHP in the     php_parse_date() function within file     ext/date/lib/parse_date.c. An unauthenticated, remote     attacker can exploit this to disclose memory contents or     cause a denial of service condition.
    (CVE-2017-11145)

  - An out-of-bounds read error exists in PHP in the     finish_nested_data() function within file     ext/standard/var_unserializer.re. An unauthenticated,     remote attacker can exploit this to disclose memory     contents or cause a denial of service condition.

  - An off-by-one overflow condition exists in PHP in the     INI parsing API, specifically in the zend_ini_do_op()     function within file Zend/zend_ini_parser.y, due to     improper validation of user-supplied input. An     unauthenticated, remote attacker can exploit this to     cause a denial of service condition or the execution of     arbitrary code.

  - A Heap buffer overread flaw in finish_nested_data     while unserializing untrusted data could lead to an     unspecified impact on the integrity of PHP.
    (CVE-2017-12933)

  - A stack-based buffer overflow in the zend_ini_do_op()     function in Zend/zend_ini_parser.c could cause a denial     of service or potentially allow executing code.
    (CVE-2017-11628)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to its banner, the version of PHP running on the remote web server is 7.0.x prior to 7.0.21. It is, therefore, affected by the following vulnerabilities :

  - An out-of-bounds read error exists in the PCRE library     in the compile_bracket_matchingpath() function within     file pcre_jit_compile.c. An unauthenticated, remote     attacker can exploit this, via a specially crafted     regular expression, to crash a process linked to the     library, resulting in a denial of service condition.
    (CVE-2017-6004)

  - An out-of-bounds read error exists in the GD Graphics     Library (LibGD) in the gdImageCreateFromGifCtx()     function within file gd_gif_in.c when handling a     specially crafted GIF file. An unauthenticated, remote     attacker can exploit this to disclose sensitive memory     contents or crash a process linked to the library.
    (CVE-2017-7890)

  - An out-of-bounds read error exists in Oniguruma in the     match_at() function within file regexec.c. An     unauthenticated, remote attacker can exploit this to     disclose sensitive memory contents or crash a process     linked to the library. (CVE-2017-9224)

  - An out-of-bounds write error exists in Oniguruma in the     next_state_val() function during regular expression     compilation. An unauthenticated, remote attacker can     exploit this to execute arbitrary code. (CVE-2017-9226)

  - An out-of-bounds read error exists in Oniguruma in the     mbc_enc_len() function within file utf8.c. An     unauthenticated, remote attacker can exploit this to     disclose memory contents or crash a process linked to     the library. (CVE-2017-9227)

  - An out-of-bounds write error exists in Oniguruma in the     bitset_set_range() function during regular expression     compilation. An unauthenticated, remote attacker can     exploit this to execute arbitrary code. (CVE-2017-9228)

  - An invalid pointer deference flaw exists in Oniguruma     in the left_adjust_char_head() function within file     regexec.c during regular expression compilation. An     unauthenticated, remote attacker can exploit this to     crash a process linked to the library, resulting in a     denial of service condition. (CVE-2017-9229)

  - A flaw exists in OpenSSL in the EVP_SealInit() function     within file crypto/evp/p_seal.c due to returning an     undocumented value of '-1'. An unauthenticated, remote     attacker can exploit this to cause an unspecified     impact. (CVE-2017-11144)

  - An out-of-bounds read error exists in PHP in the     php_parse_date() function within file     ext/date/lib/parse_date.c. An unauthenticated, remote     attacker can exploit this to disclose memory contents or     cause a denial of service condition. (CVE-2017-11145)

  - A stack-based buffer overflow condition exists in PHP     in the msgfmt_parse_message() function due to improper     validation of user-supplied input when parsing locale.
    An unauthenticated, remote attacker can exploit this to     cause a denial of service condition or the execution of     arbitrary code. (CVE-2017-11362)

  - An off-by-one overflow condition exists in PHP in the     INI parsing API, specifically in the zend_ini_do_op()     function within file Zend/zend_ini_parser.c, due to     improper validation of user-supplied input. An     unauthenticated, remote attacker can exploit this to     cause a denial of service condition or the execution of     arbitrary code. (CVE-2017-11628)

  - An out-of-bounds read error exists in PHP in the     finish_nested_data() function within file     ext/standard/var_unserializer.re. An unauthenticated,     remote attacker can exploit this to disclose memory     contents or cause a denial of service condition.
    (CVE-2017-12933)

  - A use-after-free error exists in PHP in the     zval_get_type() function within file     ext/standard/var_unserializer.c. An unauthenticated,     remote attacker can exploit this to execute arbitrary     code. (CVE-2017-12934)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to its banner, the version of PHP running on the remote web server is 5.6.x prior to 5.6.31. It is, therefore, affected by the following vulnerabilities :

  - An out-of-bounds read error exists in the PCRE library     in the compile_bracket_matchingpath() function within     file pcre_jit_compile.c. An unauthenticated, remote     attacker can exploit this, via a specially crafted     regular expression, to crash a process linked to the     library, resulting in a denial of service condition.
    (CVE-2017-6004)

  - An out-of-bounds read error exists in the GD Graphics     Library (LibGD) in the gdImageCreateFromGifCtx()     function within file gd_gif_in.c when handling a     specially crafted GIF file. An unauthenticated, remote     attacker can exploit this to disclose sensitive memory     contents or crash a process linked to the library.
    (CVE-2017-7890)

  - An out-of-bounds read error exists in Oniguruma in the     match_at() function within file regexec.c. An     unauthenticated, remote attacker can exploit this to     disclose sensitive memory contents or crash a process     linked to the library. (CVE-2017-9224)

  - An out-of-bounds write error exists in Oniguruma in the     next_state_val() function during regular expression     compilation. An unauthenticated, remote attacker can     exploit this to execute arbitrary code. (CVE-2017-9226)

  - An out-of-bounds read error exists in Oniguruma in the     mbc_enc_len() function within file utf8.c. An     unauthenticated, remote attacker can exploit this to     disclose memory contents or crash a process linked to     the library. (CVE-2017-9227)

  - An out-of-bounds write error exists in Oniguruma in the     bitset_set_range() function during regular expression     compilation. An unauthenticated, remote attacker can     exploit this to execute arbitrary code. (CVE-2017-9228)

  - An invalid pointer deference flaw exists in Oniguruma     in the left_adjust_char_head() function within file     regexec.c during regular expression compilation. An     unauthenticated, remote attacker can exploit this to     crash a process linked to the library, resulting in a     denial of service condition. (CVE-2017-9229)

  - A denial of service condition exists in PHP when     handling overlarge POST requests. An unauthenticated,     remote attacker can exploit this to exhaust available     CPU resources. (CVE-2017-11142)

  - An extended invalid free error exists in PHP in the     php_wddx_push_element() function within file     ext/wddx/wddx.c when parsing empty boolean tags.
    An unauthenticated, remote attacker can exploit this to     cause a denial of service condition. (CVE-2017-11143)

  - A flaw exists in OpenSSL in the EVP_SealInit() function     within file crypto/evp/p_seal.c due to returning an     undocumented value of '-1'. An unauthenticated, remote     attacker can exploit this to cause an unspecified     impact. (CVE-2017-11144)

  - An out-of-bounds read error exists in PHP in the     php_parse_date() function within file     ext/date/lib/parse_date.c. An unauthenticated, remote     attacker can exploit this to disclose memory contents or     cause a denial of service condition.
    (CVE-2017-11145)

  - An out-of-bounds read error exists in PHP in the     finish_nested_data() function within file     ext/standard/var_unserializer.re. An unauthenticated,     remote attacker can exploit this to disclose memory     contents or cause a denial of service condition.

  - An off-by-one overflow condition exists in PHP in the     INI parsing API, specifically in the zend_ini_do_op()     function within file Zend/zend_ini_parser.y, due to     improper validation of user-supplied input. An     unauthenticated, remote attacker can exploit this to     cause a denial of service condition or the execution of     arbitrary code.

  - A Heap buffer overread flaw in finish_nested_data     while unserializing untrusted data could lead to an     unspecified impact on the integrity of PHP.
    (CVE-2017-12933)

  - A stack-based buffer overflow in the zend_ini_do_op()     function in Zend/zend_ini_parser.c could cause a denial     of service or potentially allow executing code.
    (CVE-2017-11628)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote host is affected by the vulnerability described in GLSA-201706-11 (PCRE library: Denial of Service)

    It was found that the compile_bracket_matchingpath function in       pcre_jit_compile.c in PCRE library is vulnerable to an out-of-bounds       read.
  Impact :

    A remote attacker could possibly cause a Denial of Service condition via       a special crafted regular expression.
  Workaround :

    There is no known workaround at this time.

This release fixes pcregrep multi-line matching with --only-matching option, a crash when JIT-compiling some patterns (CVE-2017-6004) and a possible buffer overflow when formatting a pcregrep error message.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
199957	RHEL 7 : pcre (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
196306	RHEL 7 : pcre (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	high
166014	Ubuntu 16.04 ESM : PCRE vulnerabilities (USN-5665-1)	Nessus	Ubuntu Local Security Checks	high
155134	SUSE SLED12 / SLES12 Security Update : pcre (SUSE-SU-2021:3652-1)	Nessus	SuSE Local Security Checks	high
98844	PHP 7.0.x < 7.0.21 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
98822	PHP 5.6.x < 5.6.31 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
103121	Tenable SecurityCenter PHP < 5.6.31 Multiple Vulnerabilities (TNS-2017-12	Nessus	Misc.	critical
101526	PHP 7.0.x < 7.0.21 Multiple Vulnerabilities	Nessus	CGI abuses	critical
101525	PHP 5.6.x < 5.6.31 Multiple Vulnerabilities	Nessus	CGI abuses	critical
100654	GLSA-201706-11 : PCRE library: Denial of Service	Nessus	Gentoo Local Security Checks	high
97339	Fedora 24 : pcre (2017-a8dc348834)	Nessus	Fedora Local Security Checks	high

Detections

Analytics

CVE-2017-6004

high

Tenable Plugins

critical

high

high

high

critical

critical

critical

critical

critical

high

high