Bug#1022556: exim4: CVE-2022-3620

[Moritz Mühlenhoff]

Source: exim4
X-Debbugs-CC: team at security.debian.org
Severity: important
Tags: security

Hi,

The following vulnerability was published for exim4.

CVE-2022-3620[0]:
| A vulnerability was found in Exim and classified as problematic. This
| issue affects the function dmarc_dns_lookup of the file dmarc.c of the
| component DMARC Handler. The manipulation leads to use after free. The
| attack may be initiated remotely. The name of the patch is
| 12fb3842f81bcbd4a4519d5728f2d7e0e3ca1445. It is recommended to apply a
| patch to fix this issue. The associated identifier of this
| vulnerability is VDB-211919.

Introduced by: https://git.exim.org/exim.git/commit/92583637b25b6bde926f9ca6be7b085e5ac8b1e6 (exim-4.95-RC0)
(as such Bullseye/Buster are not affected)

Fixed by: https://git.exim.org/exim.git/commit/12fb3842f81bcbd4a4519d5728f2d7e0e3ca1445

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-2022-3620
    https://www.cve.org/CVERecord?id=CVE-2022-3620

Please adjust the affected versions in the BTS as needed.