An exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc 2.30.9000. Calling memcpy() (on ARMv7 targets that utilize the GNU glibc implementation) with a negative value for the 'num' parameter results in a signed comparison vulnerability. If an attacker underflows the 'num' parameter to memcpy(), this vulnerability could lead to undefined behavior such as writing to out-of-bounds memory and potentially remote code execution. Furthermore, this memcpy() implementation allows for program execution to continue in scenarios where a segmentation fault or crash should have occurred. The dangers occur in that subsequent execution and iterations of this code will be executed with this corrupted data.

The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3152 advisory.

  - The iconv program in the GNU C Library (aka glibc or libc6) 2.31 and earlier, when invoked with multiple     suffixes in the destination encoding (TRANSLATE or IGNORE) along with the -c option, enters an infinite     loop when processing invalid multi-byte input sequences, leading to a denial of service. (CVE-2016-10228)

  - On the x86-64 architecture, the GNU C Library (aka glibc) before 2.31 fails to ignore the     LD_PREFER_MAP_32BIT_EXEC environment variable during program execution after a security transition,     allowing local attackers to restrict the possible mapping addresses for loaded libraries and thus bypass     ASLR for a setuid program. (CVE-2019-19126)

  - The iconv feature in the GNU C Library (aka glibc or libc6) through 2.32, when processing invalid multi-     byte input sequences in the EUC-KR encoding, may have a buffer over-read. (CVE-2019-25013)

  - The GNU C Library (aka glibc or libc6) before 2.32 could overflow an on-stack buffer during range     reduction if an input to an 80-bit long double function contains a non-canonical bit pattern, a seen when     passing a 0x5d414141414141410000 value to sinl on x86 targets. This is related to     sysdeps/ieee754/ldbl-96/e_rem_pio2l.c. (CVE-2020-10029)

  - A use-after-free vulnerability introduced in glibc upstream version 2.14 was found in the way the tilde     expansion was carried out. Directory paths containing an initial tilde followed by a valid username were     affected by this issue. A local attacker could exploit this flaw by creating a specially crafted path     that, when processed by the glob function, would potentially lead to arbitrary code execution. This was     fixed in version 2.32. (CVE-2020-1752)

  - The iconv function in the GNU C Library (aka glibc or libc6) 2.32 and earlier, when processing invalid     multi-byte input sequences in IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 encodings, fails to advance     the input state, which could lead to an infinite loop in applications, resulting in a denial of service, a     different vulnerability from CVE-2016-10228. (CVE-2020-27618)

  - An exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc     2.30.9000. Calling memcpy() (on ARMv7 targets that utilize the GNU glibc implementation) with a negative     value for the 'num' parameter results in a signed comparison vulnerability. If an attacker underflows the     'num' parameter to memcpy(), this vulnerability could lead to undefined behavior such as writing to out-     of-bounds memory and potentially remote code execution. Furthermore, this memcpy() implementation allows     for program execution to continue in scenarios where a segmentation fault or crash should have occurred.
    The dangers occur in that subsequent execution and iterations of this code will be executed with this     corrupted data. (CVE-2020-6096)

  - The nameserver caching daemon (nscd) in the GNU C Library (aka glibc or libc6) 2.29 through 2.33, when     processing a request for netgroup lookup, may crash due to a double-free, potentially resulting in     degraded service or Denial of Service on the local system. This is related to netgroupcache.c.
    (CVE-2021-27645)

  - The iconv function in the GNU C Library (aka glibc or libc6) 2.32 and earlier, when processing invalid     input sequences in the ISO-2022-JP-3 encoding, fails an assertion in the code path and aborts the program,     potentially resulting in a denial of service. (CVE-2021-3326)

  - The mq_notify function in the GNU C Library (aka glibc) versions 2.32 and 2.33 has a use-after-free. It     may use the notification thread attributes object (passed through its struct sigevent parameter) after it     has been freed by the caller, leading to a denial of service (application crash) or possibly unspecified     other impact. (CVE-2021-33574)

  - The wordexp function in the GNU C Library (aka glibc) through 2.33 may crash or read arbitrary memory in     parse_param (in posix/wordexp.c) when called with an untrusted, crafted pattern, potentially resulting in     a denial of service or disclosure of information. This occurs because atoi was used but strtoul should     have been used to ensure correct calculations. (CVE-2021-35942)

  - A flaw was found in glibc. An off-by-one buffer overflow and underflow in getcwd() may lead to memory     corruption when the size of the buffer is exactly 1. A local attacker who can control the input buffer and     size passed to getcwd() in a setuid program could use this flaw to potentially execute arbitrary code and     escalate their privileges on the system. (CVE-2021-3999)

  - The deprecated compatibility function svcunix_create in the sunrpc module of the GNU C Library (aka glibc)     through 2.34 copies its path argument on the stack without validating its length, which may result in a     buffer overflow, potentially resulting in a denial of service or (if an application is not built with a     stack protector enabled) arbitrary code execution. (CVE-2022-23218)

  - The deprecated compatibility function clnt_create in the sunrpc module of the GNU C Library (aka glibc)     through 2.34 copies its hostname argument on the stack without validating its length, which may result in     a buffer overflow, potentially resulting in a denial of service or (if an application is not built with a     stack protector enabled) arbitrary code execution. (CVE-2022-23219)

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

The remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5310-1 advisory.

    Jan Engelhardt, Tavis Ormandy, and others discovered that the GNU C Library iconv feature incorrectly     handled certain input sequences. An attacker could possibly use this issue to cause the GNU C Library to     hang or crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu     20.04 LTS. (CVE-2016-10228, CVE-2019-25013, CVE-2020-27618, CVE-2020-29562, CVE-2021-3326)

    Jason Royes and Samuel Dytrych discovered that the GNU C Library incorrectly handled signed comparisons on     ARMv7 targets. A remote attacker could use this issue to cause the GNU C Library to crash, resulting in a     denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 18.04 LTS and     Ubuntu 20.04 LTS. (CVE-2020-6096)

    It was discovered that the GNU C Library nscd daemon incorrectly handled certain netgroup lookups. An     attacker could possibly use this issue to cause the GNU C Library to crash, resulting in a denial of     service. This issue only affected Ubuntu 20.04 LTS. (CVE-2021-27645)

    It was discovered that the GNU C Library wordexp function incorrectly handled certain patterns. An     attacker could use this issue to cause the GNU C Library to crash, resulting in a denial of service, or     possibly obtain sensitive information. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.
    (CVE-2021-35942)

    It was discovered that the GNU C Library realpath function incorrectly handled return values. An attacker     could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 21.10.
    (CVE-2021-3998)

    It was discovered that the GNU C library getcwd function incorrectly handled buffers. An attacker could     use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute     arbitrary code. (CVE-2021-3999)

    It was discovered that the GNU C Library sunrpc module incorrectly handled buffer lengths. An attacker     could possibly use this issue to cause the GNU C Library to crash, resulting in a denial of service.
    (CVE-2022-23218, CVE-2022-23219)

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 Ubuntu 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4954-1 advisory.

    Jason Royes and Samuel Dytrych discovered that the memcpy() implementation for 32 bit ARM processors in     the GNU C Library contained an integer underflow vulnerability. An attacker could possibly use this to     cause a denial of service (application crash) or execute arbitrary code. (CVE-2020-6096)

    It was discovered that the POSIX regex implementation in the GNU C Library did not properly parse     alternatives. An attacker could use this to cause a denial of service. (CVE-2009-5155)

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.

According to the versions of the glibc packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - An exploitable signed comparison vulnerability exists     in the ARMv7 memcpy() implementation of GNU glibc     2.30.9000. Calling memcpy() (on ARMv7 targets that     utilize the GNU glibc implementation) with a negative     value for the 'num' parameter results in a signed     comparison vulnerability. If an attacker underflows the     'num' parameter to memcpy(), this vulnerability could     lead to undefined behavior such as writing to     out-of-bounds memory and potentially remote code     execution. Furthermore, this memcpy() implementation     allows for program execution to continue in scenarios     where a segmentation fault or crash should have     occurred. The dangers occur in that subsequent     execution and iterations of this code will be executed     with this corrupted data.(CVE-2020-6096)

  - The iconv function in the GNU C Library (aka glibc or     libc6) 2.30 to 2.32, when converting UCS4 text     containing an irreversible character, fails an     assertion in the code path and aborts the program,     potentially resulting in a denial of     service.(CVE-2020-29562)

  - sysdeps/i386/ldbl2mpn.c in the GNU C Library (aka glibc     or libc6) before 2.23 on x86 targets has a stack-based     buffer overflow if the input to any of the printf     family of functions is an 80-bit long double with a     non-canonical bit pattern, as seen when passing a     \x00\x04\x00\x00\x00\x00\x00\x00\x00\x04 value to     sprintf. NOTE: the issue does not affect glibc by     default in 2016 or later (i.e., 2.23 or later) because     of commits made in 2015 for inlining of C99 math     functions through use of GCC built-ins. In other words,     the reference to 2.23 is intentional despite the     mention of 'Fixed for glibc 2.33' in the 26649     reference.(CVE-2020-29573)

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

The version of glibc installed on the remote host is prior to 2.26-41. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2021-1605 advisory.

  - The iconv program in the GNU C Library (aka glibc or libc6) 2.31 and earlier, when invoked with multiple     suffixes in the destination encoding (TRANSLATE or IGNORE) along with the -c option, enters an infinite     loop when processing invalid multi-byte input sequences, leading to a denial of service. (CVE-2016-10228)

  - The iconv feature in the GNU C Library (aka glibc or libc6) through 2.32, when processing invalid multi-     byte input sequences in the EUC-KR encoding, may have a buffer over-read. (CVE-2019-25013)

  - The iconv function in the GNU C Library (aka glibc or libc6) 2.30 to 2.32, when converting UCS4 text     containing an irreversible character, fails an assertion in the code path and aborts the program,     potentially resulting in a denial of service. (CVE-2020-29562)

  - An exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc     2.30.9000. Calling memcpy() (on ARMv7 targets that utilize the GNU glibc implementation) with a negative     value for the 'num' parameter results in a signed comparison vulnerability. If an attacker underflows the     'num' parameter to memcpy(), this vulnerability could lead to undefined behavior such as writing to out-     of-bounds memory and potentially remote code execution. Furthermore, this memcpy() implementation allows     for program execution to continue in scenarios where a segmentation fault or crash should have occurred.
    The dangers occur in that subsequent execution and iterations of this code will be executed with this     corrupted data. (CVE-2020-6096)

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-202101-20 (glibc: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in glibc. Please review       the CVE identifiers referenced below for details.
  Impact :

    Please review the referenced CVE identifiers for details.
  Workaround :

    There is no known workaround at this time.

The remote Fedora 32 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2021-6e581c051a advisory.

  - The iconv program in the GNU C Library (aka glibc or libc6) 2.31 and earlier, when invoked with multiple     suffixes in the destination encoding (TRANSLATE or IGNORE) along with the -c option, enters an infinite     loop when processing invalid multi-byte input sequences, leading to a denial of service. (CVE-2016-10228)

  - The iconv feature in the GNU C Library (aka glibc or libc6) through 2.32, when processing invalid multi-     byte input sequences in the EUC-KR encoding, may have a buffer over-read. (CVE-2019-25013)

  - An exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc     2.30.9000. Calling memcpy() (on ARMv7 targets that utilize the GNU glibc implementation) with a negative     value for the 'num' parameter results in a signed comparison vulnerability. If an attacker underflows the     'num' parameter to memcpy(), this vulnerability could lead to undefined behavior such as writing to out-     of-bounds memory and potentially remote code execution. Furthermore, this memcpy() implementation allows     for program execution to continue in scenarios where a segmentation fault or crash should have occurred.
    The dangers occur in that subsequent execution and iterations of this code will be executed with this     corrupted data. (CVE-2020-6096)

  - The iconv function in the GNU C Library (aka glibc or libc6) 2.30 to 2.32, when converting UCS4 text     containing an irreversible character, fails an assertion in the code path and aborts the program,     potentially resulting in a denial of service. (CVE-2020-29562)

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

According to the version of the glibc packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerability :

  - An exploitable signed comparison vulnerability exists     in the ARMv7 memcpy() implementation of GNU glibc     2.30.9000. Calling memcpy() (on ARMv7 targets that     utilize the GNU glibc implementation) with a negative     value for the 'num' parameter results in a signed     comparison vulnerability. If an attacker underflows the     'num' parameter to memcpy(), this vulnerability could     lead to undefined behavior such as writing to     out-of-bounds memory and potentially remote code     execution. Furthermore, this memcpy() implementation     allows for program execution to continue in scenarios     where a segmentation fault or crash should have     occurred. The dangers occur in that subsequent     execution and iterations of this code will be executed     with this corrupted data.(CVE-2020-6096)

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

According to the versions of the glibc packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - An out-of-bounds write vulnerability was found in glibc     when handling signal trampolines on PowerPC. The     backtrace function did not properly check the array     bounds when storing the frame address resulting in a     denial of service or potential code execution. The     highest threat from this vulnerability is to system     availability.(CVE-2020-1751)

  - A signed comparison vulnerability was found in GNU libc     in the ARMv7 implementation of memcpy(). The flaw     affects the third argument to memcpy() that specifies     the number of bytes to copy. An underflow on the third     argument could lead to undefined behavior such as     out-of-bounds memory write and potentially remote code     execution.(CVE-2020-6096)

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

According to the version of the glibc packages installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - An exploitable signed comparison vulnerability exists     in the ARMv7 memcpy() implementation of GNU glibc     2.30.9000. Calling memcpy() (on ARMv7 targets that     utilize the GNU glibc implementation) with a negative     value for the 'num' parameter results in a signed     comparison vulnerability. If an attacker underflows the     'num' parameter to memcpy(), this vulnerability could     lead to undefined behavior such as writing to     out-of-bounds memory and potentially remote code     execution. Furthermore, this memcpy() implementation     allows for program execution to continue in scenarios     where a segmentation fault or crash should have     occurred. The dangers occur in that subsequent     execution and iterations of this code will be executed     with this corrupted data.(CVE-2020-6096)

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

This update incorporates fixes from the upstream glibc 2.30 stable release branch, including a fix for a medium severity security vulnerability. (CVE-2020-6096)

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.

This update incorporates fixes from the upstream glibc 2.31 stable release branch, including a fix for a medium severity security vulnerability. (CVE-2020-6096)

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
166426	Debian DLA-3152-1 : glibc - LTS security update	Nessus	Debian Local Security Checks	critical
158502	Ubuntu 18.04 LTS / 20.04 LTS : GNU C Library vulnerabilities (USN-5310-1)	Nessus	Ubuntu Local Security Checks	critical
149477	Ubuntu 16.04 LTS : GNU C Library vulnerabilities (USN-4954-1)	Nessus	Ubuntu Local Security Checks	high
147594	EulerOS Virtualization 2.9.1 : glibc (EulerOS-SA-2021-1600)	Nessus	Huawei Local Security Checks	high
146627	Amazon Linux 2 : glibc (ALAS-2021-1605)	Nessus	Amazon Linux Local Security Checks	high
145333	GLSA-202101-20 : glibc: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
145196	Fedora 32 : glibc (2021-6e581c051a)	Nessus	Fedora Local Security Checks	high
140967	EulerOS Virtualization for ARM 64 3.0.6.0 : glibc (EulerOS-SA-2020-2019)	Nessus	Huawei Local Security Checks	high
140326	EulerOS Virtualization for ARM 64 3.0.2.0 : glibc (EulerOS-SA-2020-1956)	Nessus	Huawei Local Security Checks	high
139952	EulerOS 2.0 SP8 : glibc (EulerOS-SA-2020-1849)	Nessus	Huawei Local Security Checks	high
139259	Fedora 31 : glibc (2020-4e92a61688)	Nessus	Fedora Local Security Checks	high
138656	Fedora 32 : glibc (2020-d860479b2a)	Nessus	Fedora Local Security Checks	high

Detections

Analytics

CVE-2020-6096

high

Tenable Plugins

critical

critical

high

high

high

high

high

high

high

high

high

high