CVE-2021-27645

NameCVE-2021-27645
DescriptionThe nameserver caching daemon (nscd) in the GNU C Library (aka glibc or libc6) 2.29 through 2.33, when processing a request for netgroup lookup, may crash due to a double-free, potentially resulting in degraded service or Denial of Service on the local system. This is related to netgroupcache.c.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitylow
Debian Bugs983479

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
glibc (PTS)stretch2.24-11+deb9u4vulnerable
stretch (security)2.24-11+deb9u1vulnerable
buster2.28-10vulnerable
bullseye2.31-13fixed
bookworm2.31-17fixed
sid2.32-3fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
glibcsource(unstable)2.31-10983479

Notes

[buster] - glibc <no-dsa> (Minor issue)
[stretch] - glibc <no-dsa> (Minor issue)
https://sourceware.org/bugzilla/show_bug.cgi?id=27462
Introduced by: https://sourceware.org/git/?p=glibc.git;a=commit;h=745664bd798ec8fd50438605948eea594179fba1 (glibc-2.29)
Fixed by: https://sourceware.org/git/?p=glibc.git;a=commit;h=dca565886b5e8bd7966e15f0ca42ee5cff686673
Introducing commit present in Debian since 2.28-1 with addition of
https://salsa.debian.org/glibc-team/glibc/-/commit/aea56157b456d4d9bef337d0149e952a41a7d919

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