PT-2024-4731 · Exim+4 · Exim+4

Phillip Szelat · Published 2024-07-04 · Updated 2026-03-10 · CVE-2024-39929

Positive Technologies · (AI Summary)

CVSS v2.0

6.4

Medium

AV:N/AC:L/Au:N/C:P/I:P/A:N

Name of the Vulnerable Software and Affected Versions:

Exim versions prior to 4.98 Exim versions 4.97.1 and earlier Exim versions 4.93-13ubuntu1.12 and earlier Exim versions 4.94.2-7+deb11u3 and earlier Exim versions 4.96-15+deb12u5 and earlier

Description:

Exim is vulnerable to a parsing error in multiline RFC 2231 header filenames. This allows remote attackers to bypass the $mime filename extension-blocking protection mechanism and potentially deliver executable attachments to user mailboxes. Approximately 1.56 million servers are potentially affected, with a significant concentration in the U.S., Russia, and Canada.

Recommendations:

Exim versions prior to 4.98: Upgrade to version 4.98 or later. Exim versions 4.97.1 and earlier: Upgrade to version 4.98 or later. Exim versions 4.93-13ubuntu1.12 and earlier: Upgrade to version 4.93-13ubuntu1.12 or later. Exim versions 4.94.2-7+deb11u3 and earlier: Upgrade to version 4.94.2-7+deb11u3 or later. Exim versions 4.96-15+deb12u5 and earlier: Upgrade to version 4.96-15+deb12u5 or later.

Exploit

Fix

Improper Encoding or Escaping of Output

Protection Mechanism Failure

Weakness Enumeration

CWE-116

CWE-693

Related Identifiers

BDU:2024-05250

CVE-2024-39929

DSA-5728-1

OESA-2024-2105

OESA-2024-2129

OPENSUSE-SU-2024:0218-1

OPENSUSE-SU-2024:14196-1

USN-6939-1

Affected Products

Astra Linux

Exim

Linuxmint

Red Os

Ubuntu

References · 56

• 🔥 https://github.com/michael-david-fry/CVE-2024-39929 · Exploit
• 🔥 https://github.com/rxerium/CVE-2024-39929 · Exploit
• https://bdu.fstec.ru/vul/2024-05250 · Security Note
• https://wiki.astralinux.ru/astra-linux-se18-bulletin-2024-0905SE18MD · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2024-39929 · Security Note
• https://wiki.astralinux.ru/astra-linux-se47-bulletin-2024-1031SE47 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2024-2105 · Vendor Advisory
• https://git.exim.org/exim.git/commit/6ce5c70cff8989418e05d01fd2a57703007a6357 · Patch
• https://ubuntu.com/security/CVE-2024-39929 · Vendor Advisory
• https://bugs.exim.org/show_bug.cgi?id=3099#c4 · Vendor Advisory
• https://osv.dev/vulnerability/USN-6939-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2024-39929 · Security Note
• https://git.exim.org/exim.git/commit/1b3209b0577a9327ebb076f3b32b8a159c253f7b · Patch
• https://osv.dev/vulnerability/openSUSE-SU-2024:0218-1 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2024:14196-1 · Vendor Advisory