Huawei EulerOS: Security Advisory for spamassassin (EulerOS-SA-2020-2272)

Published: 2020-10-30 10:45:23
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:M/Au:N/C:C/I:C/A:C

Summary:
The remote host is missing an update for the Huawei EulerOS 'spamassassin' Linux Distribution Package(s) announced via the EulerOS-SA-2020-2272 advisory.

Detection Method:
Checks if a vulnerable Linux Distribution Package version is present on the target host.

Technical Details:
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.(CVE-2017-15705) Apache SpamAssassin 3.4.2 fixes a local user code injection in the meta rule syntax.(CVE-2018-11781) In Apache SpamAssassin before 3.4.3, a message can be crafted in a way to use excessive resources. Upgrading to SA 3.4.3 as soon as possible is the recommended fix but details will not be shared publicly.(CVE-2019-12420) A command execution issue was found in Apache SpamAssassin prior to 3.4.3. Carefully crafted nefarious Configuration (.cf) files can be configured to run system commands similar to CVE-2018-11805. This issue is less stealthy and attempts to exploit the issue will throw warnings. Thanks to Damian Lukowski at credativ for reporting the issue ethically. With this bug unpatched, exploits can be injected in a number of scenarios though doing so remotely is difficult. In addition to upgrading to SA 3.4.4, we again recommend that users should only use update channels or 3rd party .cf files from trusted places.(CVE-2020-1931)

Affected Versions:
'spamassassin' Linux Distribution Package(s) on Huawei EulerOS V2.0SP5.

Recommendations:
Please install the updated Linux Distribution Package(s).

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2017-15705
https://nvd.nist.gov/vuln/detail/CVE-2018-11781
https://nvd.nist.gov/vuln/detail/CVE-2019-12420
https://nvd.nist.gov/vuln/detail/CVE-2020-1931

References:


https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2020-2272

Severity
High
CVSS Score
9.3
Published
2020-10-30
Modified
2020-11-02
Category
Huawei EulerOS Local Security Checks

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