CVE-2017-15705 (GCVE-0-2017-15705)
Vulnerability from cvelistv5
Published
2018-09-17 14:00
Modified
2024-09-16 23:15
Severity ?
CWE
  • Denial of Service
Summary
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
security@apache.org http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00002.html
security@apache.org http://www.securityfocus.com/bid/105347 Third Party Advisory, VDB Entry
security@apache.org https://access.redhat.com/errata/RHSA-2018:2916 Third Party Advisory
security@apache.org https://lists.apache.org/thread.html/7f6a16bc0fd0fd5e67c7fd95bd655069a2ac7d1f88e42d3c853e601c%40%3Cannounce.apache.org%3E
security@apache.org https://lists.debian.org/debian-lts-announce/2018/11/msg00016.html Third Party Advisory
security@apache.org https://security.gentoo.org/glsa/201812-07
security@apache.org https://usn.ubuntu.com/3811-1/ Third Party Advisory
security@apache.org https://usn.ubuntu.com/3811-2/ Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00002.html
af854a3a-2127-422b-91ae-364da2661108 http://www.securityfocus.com/bid/105347 Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108 https://access.redhat.com/errata/RHSA-2018:2916 Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://lists.apache.org/thread.html/7f6a16bc0fd0fd5e67c7fd95bd655069a2ac7d1f88e42d3c853e601c%40%3Cannounce.apache.org%3E
af854a3a-2127-422b-91ae-364da2661108 https://lists.debian.org/debian-lts-announce/2018/11/msg00016.html Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://security.gentoo.org/glsa/201812-07
af854a3a-2127-422b-91ae-364da2661108 https://usn.ubuntu.com/3811-1/ Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 https://usn.ubuntu.com/3811-2/ Third Party Advisory
Impacted products
Vendor Product Version
Apache Software Foundation Apache SpamAssassin Version: all modern versions before 3.4.2
 Create a notification for this product.
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