[Pkg-matrix-maintainers] Bug#989997: olm: CVE-2021-34813

[Salvatore Bonaccorso]

Source: olm
Version: 3.2.1~dfsg-7
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>
Control: fixed -1 3.2.3~dfsg-1

Hi,

The following vulnerability was published for olm.

CVE-2021-34813[0]:
| Matrix libolm before 3.2.3 allows a malicious Matrix homeserver to
| crash a client (while it is attempting to retrieve an Olm encrypted
| room key backup from the homeserver) because olm_pk_decrypt has a
| stack-based buffer overflow. Remote code execution might be possible
| for some nonstandard build configurations.


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-2021-34813
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-34813
[1] https://gitlab.matrix.org/matrix-org/olm/-/commit/ccc0d122ee1b4d5e5ca4ec1432086be17d5f901b
[2] https://matrix.org/blog/2021/06/14/adventures-in-fuzzing-libolm

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore