SMTP: Exim Multiline RFC2231 Header Filename Parsing Policy Bypass
This signature detects attempts to exploit a known vulnerability against Exim. A successful attack can lead to security bypass.
Extended Description
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
CVE: CVE-2024-39929
Short Name
SMTP:EXIM-HDR-FL-NME-BYPSS
Severity
Minor
Recommended
False
Recommended Action
None
Category
SMTP
Keywords
Bypass CVE-2024-39929 Exim Filename Header Multiline Parsing Policy RFC2231
Release Date
09/05/2024
Supported Platforms
mx-19.3
vmx-19.3
vsrx-19.2
srx-19.3
srx-branch-19.3
vsrx3bsd-19.2
srx-19.4
vsrx3bsd-19.4
srx-branch-19.4
vsrx-19.4
vmx-19.4
mx-19.4
srxevo-25.4
vsrx-26.2
srx-26.2
srx-branch-26.2
vsrx3bsd-26.2
mx-12.3
srx-12.3
srx-branch-12.3
vsrx-12.3
Sigpack Version
3738
False Positive
Unknown