glibc: CVE-2021-27645: double-free in nscd

Debian Bug report logs - #983479
glibc: CVE-2021-27645: double-free in nscd

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: glibc: CVE-2021-27645: double-free in nscd

Date: Wed, 24 Feb 2021 21:35:10 +0100

Source: glibc
Version: 2.31-9
Severity: important
Tags: security upstream
Forwarded: https://sourceware.org/bugzilla/show_bug.cgi?id=27462
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>,fw@debian.org
Control: found -1 2.28-10
Control: found -1 2.28-1

Hi,

The following vulnerability was published for glibc.

CVE-2021-27645[0]:
| The 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.

Upstream this has been introduced in 2.29 but AFAICS we have the
problematic change since 2.28-1 in Debian itself due to [2].

If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2021-27645
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27645
[1] https://sourceware.org/bugzilla/show_bug.cgi?id=27462
[2] https://salsa.debian.org/glibc-team/glibc/-/commit/aea56157b456d4d9bef337d0149e952a41a7d919

Regards,
Salvatore

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