update: glibc

[dongsupark]

Name: glibc
CVEs: CVE-2023-4527, CVE-2023-4806
CVSSs: 8.2, 7.5
Action Needed: update to >= 2.37-r5 or >= 2.38-r2

Summary:

• CVE-2023-4527: 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-2023-4806: 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.

refmap.gentoo: https://bugs.gentoo.org/914281

[t-lo]

2.37-rc5 looks like a low-hanging fruit. Poked at this with a PR so we can run a test build: flatcar/scripts#1171