nscd: netgroup cache assumes NSS callback uses in-buffer strings

The Name Service Cache Daemon's (nscd) netgroup cache can corrupt memory
when the NSS callback does not store all strings in the provided buffer.
The flaw was introduced in glibc 2.15 when the cache was added to nscd.

This vulnerability is only present in the nscd binary.

There is no guarantee from the NSS callback API that the returned
strings are all within the buffer. However, the netgroup cache code
assumes that the NSS callback uses in-buffer strings and if it doesn't
the buffer resizing logic could lead to potential memory corruption.

CVE-Id: CVE-2024-33602
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)