CVE-2024-39929 Affecting exim4 package, versions <4.90.1-1ubuntu1.10+esm5
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU1804-EXIM4-7425686
- published1 Aug 2024
- disclosed4 Jul 2024
Introduced: 4 Jul 2024
CVE-2024-39929 (opens in a new tab)How to fix?
Upgrade Ubuntu:18.04 exim4 to version 4.90.1-1ubuntu1.10+esm5 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream exim4 package and not the exim4 package as distributed by Ubuntu.
See How to fix? for Ubuntu:18.04 relevant fixed versions and status.
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.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2024-39929
- https://bugs.exim.org/show_bug.cgi?id=3099#c4
- https://git.exim.org/exim.git/commit/1b3209b0577a9327ebb076f3b32b8a159c253f7b
- https://git.exim.org/exim.git/commit/6ce5c70cff8989418e05d01fd2a57703007a6357
- https://github.com/Exim/exim/compare/exim-4.98-RC2...exim-4.98-RC3
- https://www.rfc-editor.org/rfc/rfc2231.txt