CVE-2017-15705

medium
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Description

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

http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00002.html

http://www.securityfocus.com/bid/105347

https://access.redhat.com/errata/RHSA-2018:2916

https://lists.apache.org/thread.html/[email protected]%3Cannounce.apache.org%3E

https://lists.debian.org/debian-lts-announce/2018/11/msg00016.html

https://security.gentoo.org/glsa/201812-07

https://usn.ubuntu.com/3811-1/

https://usn.ubuntu.com/3811-2/

Details

Source: MITRE

Published: 2018-09-17

Updated: 2018-12-16

Type: CWE-20

Risk Information

CVSS v2

Base Score: 5

Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

Impact Score: 2.9

Exploitability Score: 10

Severity: MEDIUM

CVSS v3

Base Score: 5.3

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Impact Score: 1.4

Exploitability Score: 3.9

Severity: MEDIUM

Tenable Plugins

View all (19 total)

IDNameProductFamilySeverity
146670EulerOS 2.0 SP2 : spamassassin (EulerOS-SA-2021-1360)NessusHuawei Local Security Checks
high
142129EulerOS 2.0 SP5 : spamassassin (EulerOS-SA-2020-2272)NessusHuawei Local Security Checks
high
127751SUSE SLED15 / SLES15 Security Update : spamassassin (SUSE-SU-2019:2011-1)NessusSuSE Local Security Checks
critical
127739openSUSE Security Update : spamassassin (openSUSE-2019-1831)NessusSuSE Local Security Checks
critical
127217NewStart CGSL CORE 5.04 / MAIN 5.04 : spamassassin Multiple Vulnerabilities (NS-SA-2019-0041)NessusNewStart CGSL Local Security Checks
high
127038SUSE SLED12 / SLES12 Security Update : spamassassin (SUSE-SU-2019:1961-1)NessusSuSE Local Security Checks
critical
120609Fedora 29 : spamassassin (2018-8f0df2c366)NessusFedora Local Security Checks
critical
120387Fedora 28 : spamassassin (2018-46d7a7f63e)NessusFedora Local Security Checks
critical
119703GLSA-201812-07 : SpamAssassin: Multiple vulnerabilitiesNessusGentoo Local Security Checks
critical
118938Debian DLA-1578-1 : spamassassin security updateNessusDebian Local Security Checks
critical
118834Amazon Linux 2 : spamassassin (ALAS-2018-1103)NessusAmazon Linux Local Security Checks
high
118797Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : spamassassin vulnerabilities (USN-3811-1)NessusUbuntu Local Security Checks
critical
118211Amazon Linux AMI : spamassassin (ALAS-2018-1091)NessusAmazon Linux Local Security Checks
critical
118117CentOS 7 : spamassassin (CESA-2018:2916)NessusCentOS Local Security Checks
high
118108Scientific Linux Security Update : spamassassin on SL7.x x86_64 (20181011)NessusScientific Linux Local Security Checks
high
118077RHEL 7 : spamassassin (RHSA-2018:2916)NessusRed Hat Local Security Checks
high
118076Oracle Linux 7 : spamassassin (ELSA-2018-2916)NessusOracle Linux Local Security Checks
high
117840Fedora 27 : spamassassin (2018-6ed251c42b)NessusFedora Local Security Checks
critical
117721FreeBSD : spamassassin -- multiple vulnerabilities (613193a0-c1b4-11e8-ae2d-54e1ad3d6335)NessusFreeBSD Local Security Checks
critical