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CVE-2017-15705

Status Candidate

Overview

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.

Related Files

Gentoo Linux Security Advisory 201812-07
Posted Dec 15, 2018
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201812-7 - Multiple vulnerabilities have been found in SpamAssassin, the worst of which may lead to remote code execution. Versions prior to 3.4.2-r2 are affected.

tags | advisory, remote, vulnerability, code execution
systems | linux, gentoo
advisories | CVE-2016-1238, CVE-2017-15705, CVE-2018-11780, CVE-2018-11781
MD5 | 2bdae83b43f64a7a41f342bfc8c7b2d2
Ubuntu Security Notice USN-3811-2
Posted Nov 13, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3811-2 - USN-3811-1 fixed a vulnerability in SpamAssassin. This update provides the corresponding update for Ubuntu 12.04 ESM. It was discovered that SpamAssassin incorrectly handled certain unclosed tags in emails. A remote attacker could possibly use this issue to cause a denial of service. Various other issues were also addressed.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2017-15705
MD5 | 31759ed2a6a11688c904315098dbcf10
Ubuntu Security Notice USN-3811-1
Posted Nov 6, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3811-1 - It was discovered that SpamAssassin incorrectly handled certain unclosed tags in emails. A remote attacker could possibly use this issue to cause a denial of service. It was discovered that SpamAssassin incorrectly handled the PDFInfo plugin. A remote attacker could possibly use this issue to execute arbitrary code. It was discovered that SpamAssassin incorrectly handled meta rule syntax. A local attacker could possibly use this issue to execute arbitrary code. Various other issues were also addressed.

tags | advisory, remote, denial of service, arbitrary, local
systems | linux, ubuntu
advisories | CVE-2017-15705, CVE-2018-11780, CVE-2018-11781
MD5 | 7fcbfde9589d7977e424e44fe80a9ea7
Red Hat Security Advisory 2018-2916-01
Posted Oct 12, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-2916-01 - The SpamAssassin tool provides a way to reduce unsolicited commercial email from incoming email. Issues addressed include a denial of service vulnerability.

tags | advisory, denial of service
systems | linux, redhat
advisories | CVE-2017-15705, CVE-2018-11781
MD5 | d3a8242a565d737b6647653286419ead
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