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Improper Input Validation Affecting spamassassin package, versions <3.4.2-7.4.1

Severity

 Recommended
0.0
high
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
1.91% (89th percentile)

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  • Snyk IDSNYK-SLES150-SPAMASSASSIN-2739453
  • published14 Apr 2022
  • disclosed29 Jul 2019
Report a new vulnerability Found a mistake?

Introduced: 29 Jul 2019

CVE-2017-15705  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

Upgrade SLES:15.0 spamassassin to version 3.4.2-7.4.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream spamassassin package and not the spamassassin package as distributed by SLES. See How to fix? for SLES:15.0 relevant fixed versions and status.

A denial of service vulnerability was identified that exists in Apache SpamAssassin before 3.4.2. The vulnerability arises with certain unclosed tags in emails that cause markup to be handled incorrectly leading to scan timeouts. In Apache SpamAssassin, using HTML::Parser, we setup an object and hook into the begin and end tag event handlers In both cases, the "open" event is immediately followed by a "close" event - even if the tag does not close in the HTML being parsed. Because of this, we are missing the "text" event to deal with the object normally. This can cause carefully crafted emails that might take more scan time than expected leading to a Denial of Service. The issue is possibly a bug or design decision in HTML::Parser that specifically impacts the way Apache SpamAssassin uses the module with poorly formed html. The exploit has been seen in the wild but not believed to have been purposefully part of a Denial of Service attempt. We are concerned that there may be attempts to abuse the vulnerability in the future.