Improper Input Validation Affecting spamassassin package, versions <3.4.2-1
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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- published25 Sept 2018
- disclosed17 Sept 2018
Introduced: 17 Sep 2018
CVE-2017-15705 (opens in a new tab)How to fix?
Upgrade Debian:13 spamassassin to version 3.4.2-1 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 Debian.
See How to fix? for Debian:13 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.
References
- https://security-tracker.debian.org/tracker/CVE-2017-15705
- https://lists.apache.org/thread.html/7f6a16bc0fd0fd5e67c7fd95bd655069a2ac7d1f88e42d3c853e601c@%3Cannounce.apache.org%3E
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-15705
- https://lists.debian.org/debian-lts-announce/2018/11/msg00016.html
- https://security.gentoo.org/glsa/201812-07
- https://access.redhat.com/errata/RHSA-2018:2916
- http://www.securityfocus.com/bid/105347
- http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00002.html
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2017-15705
- https://usn.ubuntu.com/3811-1/
- https://usn.ubuntu.com/3811-2/
- https://lists.apache.org/thread.html/7f6a16bc0fd0fd5e67c7fd95bd655069a2ac7d1f88e42d3c853e601c%40%3Cannounce.apache.org%3E