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, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-3152-1
Debian Bugs983479

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
glibc (PTS)buster2.28-10+deb10u1vulnerable
buster (security)2.28-10+deb10u3fixed
bullseye2.31-13+deb11u8fixed
bullseye (security)2.31-13+deb11u10fixed
bookworm2.36-9+deb12u4fixed
bookworm (security)2.36-9+deb12u7fixed
trixie2.38-12fixed
sid2.38-13fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
glibcsourcebuster2.28-10+deb10u2DLA-3152-1
glibcsource(unstable)2.31-10983479

Notes

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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