[xml/sgml-pkgs] Bug#969529: libxml2: CVE-2020-24977

[Salvatore Bonaccorso]

Source: libxml2
Version: 2.9.10+dfsg-5
Severity: important
Tags: security upstream
Forwarded: https://gitlab.gnome.org/GNOME/libxml2/-/issues/178
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for libxml2.

CVE-2020-24977[0]:
| GNOME project libxml2 v2.9.10 and earlier have a global Buffer
| Overflow vulnerability in xmlEncodeEntitiesInternal at
| libxml2/entities.c. The issue has been fixed in commit 8e7c20a1
| (20910-GITv2.9.10-103-g8e7c20a1).

Please note that the CVE description looks missleading, because
8e7c20a1 is not the fixing commit, rather [1]. There is some upstream
discussion but this appears to be really a issue for xmllint, and as
well present before the bisected commit in the upstream issue. That
said, it is marked no-dsa for buster still.

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-2020-24977
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-24977
[1] https://gitlab.gnome.org/GNOME/libxml2/-/commit/50f06b3efb638efb0abd95dc62dca05ae67882c2
[2] https://gitlab.gnome.org/GNOME/libxml2/-/issues/178

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore