Bug#1075785: exim4: CVE-2024-39929: Incorrect parsing of multiline rfc2231 header filename

[Salvatore Bonaccorso]

Source: exim4
Version: 4.97-8
Severity: grave
Tags: security upstream
Justification: user security hole
Forwarded: https://bugs.exim.org/show_bug.cgi?id=3099
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for exim4.

CVE-2024-39929[0]:
| Exim through 4.97.1 misparses a multiline RFC 2231 header filename,
| and thus remote attackers can bypass a $mime_filename extension-
| blocking protection mechanism, and potentially deliver executable
| attachments to the mailboxes of end users.


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-2024-39929
    https://www.cve.org/CVERecord?id=CVE-2024-39929
[1] https://bugs.exim.org/show_bug.cgi?id=3099#c4

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore