It was discovered that the nss_files backend for the Name Service Switch in glibc would return incorrect data to applications or corrupt the heap (depending on adjacent heap contents) in certain cases. A local attacker could potentially use this flaw to escalate their privileges. (CVE-2015-5277)

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

  - It was discovered that the nss_files backend for the     Name Service Switch in glibc would return incorrect     data to applications or corrupt the heap (depending on     adjacent heap contents). A local attacker could     potentially use this flaw to execute arbitrary code on     the system.(CVE-2015-5277)

  - A directory traveral flaw was found in the way glibc     loaded locale files. An attacker able to make an     application use a specially crafted locale name value     (for example, specified in an LC_* environment     variable) could possibly use this flaw to execute     arbitrary code with the privileges of that     application.(CVE-2014-0475)

  - It was found that out-of-range time values passed to     the strftime() function could result in an     out-of-bounds memory access. This could lead to     application crash or, potentially, information     disclosure.(CVE-2015-8776)

  - The GNU C Library (aka glibc or libc6) before 2.27     contains an off-by-one error leading to a heap-based     buffer overflow in the glob function in glob.c, related     to the processing of home directories using the ~     operator followed by a long string.(CVE-2017-15670)

  - The PTR_MANGLE implementation in the GNU C Library (aka     glibc or libc6) 2.4, 2.17, and earlier, and Embedded     GLIBC (EGLIBC) does not initialize the random value for     the pointer guard, which makes it easier for     context-dependent attackers to control execution flow     by leveraging a buffer-overflow vulnerability in an     application and using the known zero value pointer     guard to calculate a pointer address.(CVE-2013-4788)

  - An out-of-bounds read flaw was found in the way glibc's     iconv() function converted certain encoded data to     UTF-8. An attacker able to make an application call the     iconv() function with a specially crafted argument     could use this flaw to crash that     application.(CVE-2014-6040)

  - A stack overflow vulnerability was found in
    _nss_dns_getnetbyname_r. On systems with nsswitch     configured to include ''networks: dns'' with a     privileged or network-facing service that would attempt     to resolve user-provided network names, an attacker     could provide an excessively long network name,     resulting in stack corruption and code     execution.(CVE-2016-3075)

  - Integer overflow in string/strcoll_l.c in the GNU C     Library (aka glibc or libc6) 2.17 and earlier allows     context-dependent attackers to cause a denial of     service (crash) or possibly execute arbitrary code via     a long string, which triggers a heap-based buffer     overflow.(CVE-2012-4412)

  - A heap-based buffer overflow flaw was found in glibc's     swscanf() function. An attacker able to make an     application call the swscanf() function could use this     flaw to crash that application or, potentially, execute     arbitrary code with the permissions of the user running     the application.(CVE-2015-1472)

  - It was found that getaddrinfo() did not limit the     amount of stack memory used during name resolution. An     attacker able to make an application resolve an     attacker-controlled hostname or IP address could     possibly cause the application to exhaust all stack     memory and crash.(CVE-2013-1914)

  - A stack overflow vulnerability was found in nan*     functions that could cause applications, which process     long strings with the nan function, to crash or,     potentially, execute arbitrary code.(CVE-2014-9761)

  - An out-of-bounds write flaw was found in the way the     glibc's readdir_r() function handled file system     entries longer than the NAME_MAX character constant. A     remote attacker could provide a specially crafted NTFS     or CIFS file system that, when processed by an     application using readdir_r(), would cause that     application to crash or, potentially, allow the     attacker to execute arbitrary code with the privileges     of the user running the application.(CVE-2013-4237)

  - It was discovered that, under certain circumstances,     glibc's getaddrinfo() function would send DNS queries     to random file descriptors. An attacker could     potentially use this flaw to send DNS queries to     unintended recipients, resulting in information     disclosure or data loss due to the application     encountering corrupted data.(CVE-2013-7423)

  - A buffer overflow flaw was found in the way glibc's     gethostbyname_r() and other related functions computed     the size of a buffer when passed a misaligned buffer as     input. An attacker able to make an application call any     of these functions with a misaligned buffer could use     this flaw to crash the application or, potentially,     execute arbitrary code with the permissions of the user     running the application.(CVE-2015-1781)

  - The nss_dns implementation of getnetbyname in GNU C     Library (aka glibc) before 2.21, when the DNS backend     in the Name Service Switch configuration is enabled,     allows remote attackers to cause a denial of service     (infinite loop) by sending a positive answer while a     network name is being process.(CVE-2014-9402)

  - In the GNU C Library (aka glibc or libc6) through 2.29,     proceed_next_node in posix/regexec.c has a heap-based     buffer over-read via an attempted case-insensitive     regular-expression match.(CVE-2019-9169)

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 remote Oracle Linux 7 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2015-2172 advisory.

    [2.17-106.0.1.1]
    - Remove strstr and strcasestr implementations using sse4.2 instructions.
    - Upstream commits 584b18eb4df61ccd447db2dfe8c8a7901f8c8598 and       1818483b15d22016b0eae41d37ee91cc87b37510 backported.

    [2.17-106.1]
    - Rebuild with corrected release.

    [2.17-106]
    - Add fix for CVE-2015-5277 (#1275920).

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

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-201702-11 (GNU C Library: Multiple vulnerabilities)

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

    A context-dependent attacker could possibly execute arbitrary code with       the privileges of the process, disclose sensitive information, or cause a       Denial of Service condition via multiple vectors.
  Workaround :

    There is no known workaround at this time.

The remote Ubuntu 14.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-2985-1 advisory.

    Martin Carpenter discovered that pt_chown in the GNU C Library did not properly check permissions for tty     files. A local attacker could use this to gain administrative privileges or expose sensitive information.
    (CVE-2013-2207, CVE-2016-2856)

    Robin Hack discovered that the Name Service Switch (NSS) implementation in the GNU C Library did not     properly manage its file descriptors. An attacker could use this to cause a denial of service (infinite     loop). (CVE-2014-8121)

    Joseph Myers discovered that the GNU C Library did not properly handle long arguments to functions     returning a representation of Not a Number (NaN). An attacker could use this to cause a denial of service     (stack exhaustion leading to an application crash) or possibly execute arbitrary code. (CVE-2014-9761)

    Arjun Shankar discovered that in certain situations the nss_dns code in the GNU C Library did not properly     account buffer sizes when passed an unaligned buffer. An attacker could use this to cause a denial of     service or possibly execute arbitrary code. (CVE-2015-1781)

    Sumit Bose and Lukas Slebodnik discovered that the Name Service Switch (NSS) implementation in the GNU C     Library did not handle long lines in the files databases correctly. A local attacker could use this to     cause a denial of service (application crash) or possibly execute arbitrary code. (CVE-2015-5277)

    Adam Nielsen discovered that the strftime function in the GNU C Library did not properly handle out-of-     range argument data. An attacker could use this to cause a denial of service (application crash) or     possibly expose sensitive information. (CVE-2015-8776)

    Hector Marco and Ismael Ripoll discovered that the GNU C Library allowed the pointer-guarding protection     mechanism to be disabled by honoring the LD_POINTER_GUARD environment variable across privilege     boundaries. A local attacker could use this to exploit an existing vulnerability more easily.
    (CVE-2015-8777)

    Szabolcs Nagy discovered that the hcreate functions in the GNU C Library did not properly check its size     argument, leading to an integer overflow. An attacker could use to cause a denial of service (application     crash) or possibly execute arbitrary code. (CVE-2015-8778)

    Maksymilian Arciemowicz discovered a stack-based buffer overflow in the catopen function in the GNU C     Library when handling long catalog names. An attacker could use this to cause a denial of service     (application crash) or possibly execute arbitrary code. (CVE-2015-8779)

    Florian Weimer discovered that the getnetbyname implementation in the GNU C Library did not properly     handle long names passed as arguments. An attacker could use to cause a denial of service (stack     exhaustion leading to an application crash). (CVE-2016-3075)

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.

Updated glibc packages that fix one security issue are now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math libraries (libm), and the Name Server Caching Daemon (nscd) used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly.

It was discovered that the nss_files backend for the Name Service Switch in glibc would return incorrect data to applications or corrupt the heap (depending on adjacent heap contents) in certain cases. A local attacker could potentially use this flaw to escalate their privileges. (CVE-2015-5277)

This issue was discovered by Sumit Bose and Lukas Slebodnik of Red Hat.

All glibc users are advised to upgrade to these updated packages, which contain a backported patch to correct this issue.

Updated glibc packages that fix multiple security issues are now available for Red Hat Enterprise Linux 7.1 Extended Update Support.

Red Hat Product Security has rated this update as having Important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math libraries (libm), and the Name Server Caching Daemon (nscd) used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly.

It was discovered that the nss_files backend for the Name Service Switch in glibc would return incorrect data to applications or corrupt the heap (depending on adjacent heap contents). A local attacker could potentially use this flaw to execute arbitrary code on the system.
(CVE-2015-5277)

It was discovered that, under certain circumstances, glibc's getaddrinfo() function would send DNS queries to random file descriptors. An attacker could potentially use this flaw to send DNS queries to unintended recipients, resulting in information disclosure or data loss due to the application encountering corrupted data.
(CVE-2013-7423)

A buffer overflow flaw was found in the way glibc's gethostbyname_r() and other related functions computed the size of a buffer when passed a misaligned buffer as input. An attacker able to make an application call any of these functions with a misaligned buffer could use this flaw to crash the application or, potentially, execute arbitrary code with the permissions of the user running the application.
(CVE-2015-1781)

A heap-based buffer overflow flaw and a stack overflow flaw were found in glibc's swscanf() function. An attacker able to make an application call the swscanf() function could use these flaws to crash that application or, potentially, execute arbitrary code with the permissions of the user running the application. (CVE-2015-1472, CVE-2015-1473)

The CVE-2015-5277 issue was discovered by Sumit Bose and Lukas Slebodnik of Red Hat, and the CVE-2015-1781 issue was discovered by Arjun Shankar of Red Hat.

All glibc users are advised to upgrade to these updated packages, which contain backported patches to correct these issues.

A buffer overflow flaw was found in the way glibc's gethostbyname_r() and other related functions computed the size of a buffer when passed a misaligned buffer as input. An attacker able to make an application call any of these functions with a misaligned buffer could use this flaw to crash the application or, potentially, execute arbitrary code with the permissions of the user running the application.
(CVE-2015-1781)

It was discovered that the nss_files backend for the Name Service Switch in glibc would return incorrect data to applications or corrupt the heap (depending on adjacent heap contents). A local attacker could potentially use this flaw to execute arbitrary code on the system.
(CVE-2015-5277)

It was discovered that, under certain circumstances, glibc's getaddrinfo() function would send DNS queries to random file descriptors. An attacker could potentially use this flaw to send DNS queries to unintended recipients, resulting in information disclosure or data loss due to the application encountering corrupted data.
(CVE-2013-7423)

A stack overflow flaw was found in glibc's swscanf() function. An attacker able to make an application call the swscanf() function could use this flaw to crash that application or, potentially, execute arbitrary code with the permissions of the user running the application. (CVE-2015-1473)

A heap-based buffer overflow flaw was found in glibc's swscanf() function. An attacker able to make an application call the swscanf() function could use this flaw to crash that application or, potentially, execute arbitrary code with the permissions of the user running the application. (CVE-2015-1472)

ID	Name	Product	Family	Published	Updated	Severity
87638	Scientific Linux Security Update : glibc on SL7.x x86_64_important (20151119)	Nessus	Scientific Linux Local Security Checks	12/29/2015	1/14/2021	high
125005	EulerOS Virtualization 3.0.1.0 : glibc (EulerOS-SA-2019-1552)	Nessus	Huawei Local Security Checks	5/14/2019	1/6/2021	critical
87091	Oracle Linux 7 : glibc (ELSA-2015-2172)	Nessus	Oracle Linux Local Security Checks	11/30/2015	11/1/2024	critical
97254	GLSA-201702-11 : GNU C Library: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	2/21/2017	1/11/2021	critical
91334	Ubuntu 14.04 LTS : GNU C Library vulnerabilities (USN-2985-1)	Nessus	Ubuntu Local Security Checks	5/26/2016	8/27/2024	critical
87139	CentOS 7 : glibc (CESA-2015:2172)	Nessus	CentOS Local Security Checks	12/2/2015	1/4/2021	high
86974	RHEL 7 : glibc (RHSA-2015:2172)	Nessus	Red Hat Local Security Checks	11/20/2015	10/24/2019	high
88573	RHEL 7 : glibc (RHSA-2015:2589)	Nessus	Red Hat Local Security Checks	2/4/2016	10/24/2019	high
87343	Amazon Linux AMI : glibc (ALAS-2015-617)	Nessus	Amazon Linux Local Security Checks	12/15/2015	4/18/2018	high

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