nscd: netgroup cache may terminate daemon on memory allocation failure

The Name Service Cache Daemon's (nscd) netgroup cache uses xmalloc or
xrealloc and these functions may terminate the process due to a memory
allocation failure resulting in a denial of service to the clients.  The
flaw was introduced in glibc 2.15 when the cache was added to nscd.

This vulnerability is only present in the nscd binary.

Subsequent refactoring of the netgroup cache only added more uses of
xmalloc and xrealloc. Uses of xmalloc and xrealloc in other parts of
nscd only occur during startup of the daemon and so are not affected by
client requests that could trigger an out of memory followed by
termination.

CVE-Id: CVE-2024-33601
Public-Date: 2024-04-24
Vulnerable-Commit: 684ae515993269277448150a1ca70db3b94aa5bd (2.15)
Fix-Commit: c04a21e050d64a1193a6daab872bca2528bda44b (2.40)
Fix-Commit: a9a8d3eebb145779a18d90e3966009a1daa63cd8 (2.39-38)
Fix-Commit: 71af8ca864345d39b746d5cee84b94b430fad5db (2.38-75)
Fix-Commit: 6e106dc214d6a033a4e945d1c6cf58061f1c5f1f (2.37-94)
Fix-Commit: b6742463694b1dfdd5120b91ee21cf05d15ec2e2 (2.36-168)
Fix-Commit: 7a5864cac60e06000394128a5a2817b03542f5a3 (2.35-319)
Fix-Commit: 86f1d5f4129c373ac6fb6df5bcf38273838843cb (2.34-463)
Fix-Commit: 4d27d4b9a188786fc6a56745506cec2acfc51f83 (2.33-267)
Fix-Commit: 3ed195a8ec89da281e3c4bf887a13d281b72d8f4 (2.32-144)
Fix-Commit: bbf5a58ccb55679217f94de706164d15372fbbc0 (2.31-158)