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Gentoo: GLSA-202310-12 Normal: Exim Vulnerability Exploit Risk

gentoo
Calendar Grey January 28, 2021
Dist Gentoo Esm H88
An intruder could take advantage of the way NSD processes PID files, resulting in a potential Denial of Service issue. It is advisable to perform an upgrade.
A vulnerability was discovered in NSD which could allow a local attacker to cause a Denial of Service condition.

Summary

A local vulnerability was discovered that would allow for a local symlink attack due to how NSD handles PID files.

Topics%20covered

Topics Covered

security advisory denial of service gentoo local attack normal normal severity nsd

Resolution

All NSD users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-dns/nsd-4.3.4"

References

[ 1 ] CVE-2020-28935 https://nvd.nist.gov/vuln/detail/CVE-2020-28935 [ 2 ] Upstream advisory https://www.nlnetlabs.nl/downloads/nsd/CVE-2020-28935.txt

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/202101-38
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Concerns

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.

Severity: Normal
Title: NSD: Symbolic link traversal
Date: January 29, 2021
Bugs: #758977
ID: 202101-38

Topics%20covered

Topics Covered

security advisory denial of service gentoo local attack normal normal severity nsd

Synopsis

A vulnerability was discovered in NSD which could allow a local attacker to cause a Denial of Service condition.

Background

An authoritative only, high performance, open source name server

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-dns/nsd < 4.3.4 >= 4.3.4

Impact

===== A local attacker could cause a Denial of Service condition.

Workaround

There is no known workaround at this time.

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