An issue was discovered in the GNU C Library (glibc) 2.36. When the syslog function is passed a crafted input string larger than 1024 bytes, it reads uninitialized memory from the heap and prints it to the target log file, potentially revealing a portion of the contents of the heap.

An update of the glibc package has been released.

The remote host is affected by the vulnerability described in GLSA-202310-03 (glibc: Multiple vulnerabilities)

  - An issue was discovered in the GNU C Library (glibc) 2.36. When the syslog function is passed a crafted     input string larger than 1024 bytes, it reads uninitialized memory from the heap and prints it to the     target log file, potentially revealing a portion of the contents of the heap. (CVE-2022-39046)

  - A flaw was found in glibc. When the getaddrinfo function is called with the AF_UNSPEC address family and     the system is configured with no-aaaa mode via /etc/resolv.conf, a DNS response via TCP larger than 2048     bytes can potentially disclose stack contents through the function returned address data, and may cause a     crash. (CVE-2023-4527)

  - A flaw was found in glibc. In an extremely rare situation, the getaddrinfo function may access memory that     has been freed, resulting in an application crash. This issue is only exploitable when a NSS module     implements only the _nss_*_gethostbyname2_r and _nss_*_getcanonname_r hooks without implementing the
    _nss_*_gethostbyname3_r hook. The resolved name should return a large number of IPv6 and IPv4, and the     call to the getaddrinfo function should have the AF_INET6 address family with AI_CANONNAME, AI_ALL and     AI_V4MAPPED as flags. (CVE-2023-4806)

  - A buffer overflow was discovered in the GNU C Library's dynamic loader ld.so while processing the     GLIBC_TUNABLES environment variable. This issue could allow a local attacker to use maliciously crafted     GLIBC_TUNABLES environment variables when launching binaries with SUID permission to execute code with     elevated privileges. (CVE-2023-4911)

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

ID	Name	Product	Family	Type	Severity
333815	Photon OS 5.0: Glibc PHSA-2023-5.0-91-0040	Nessus	PhotonOS Local Security Checks	Local	medium
204153	Photon OS 5.0: Glibc PHSA-2023-5.0-0040	Nessus	PhotonOS Local Security Checks	Local	medium
182516	GLSA-202310-03 : glibc: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	Local	high

Detections

Analytics

CVE-2022-39046

medium

Tenable Plugins

medium

medium

high