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Gentoo: GLSA-202210-33 Normal: Libtirpc Service Disruption Due To Denial

gentoo
Calendar Grey October 30, 2022
Dist Gentoo Esm H88
Uncover the vulnerability related to DoS in Libtirpc and explore effective strategies for risk alleviation using Gentoo's latest patch.
A vulnerability has been discovered in Libtirpc which could result in denial of service.

Summary

Currently svc_run does not handle poll timeout and rendezvous_request does not handle EMFILE error returned from accept(2 as it used to. These two missing functionality were removed by commit b2c9430f46c4. The effect of not handling poll timeout allows idle TCP conections to remain ESTABLISHED indefinitely. When the number of connections reaches the limit of the open file descriptors (ulimit -n) then accept(2) fails with EMFILE. Since there is no handling of EMFILE error this causes svc_run() to get in a tight loop calling accept(2). This resulting in the RPC service of svc_run is being down, it's no longer able to service any requests.
Due to a lack of handling of certain error cases, connections to Libtirpc could remain ESTABLISHED indefinitely.

Topics%20covered

Topics Covered

security advisory denial of service gentoo normal libtirpc

Resolution

All Libtirpc users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-libs/libtirpc-1.3.2"

References

[ 1 ] CVE-2021-46828 https://nvd.nist.gov/vuln/detail/CVE-2021-46828

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/202210-33
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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: Libtirpc: Denial of Service
Date: October 31, 2022
Bugs: #859634
ID: 202210-33

Topics%20covered

Topics Covered

security advisory denial of service gentoo normal libtirpc

Synopsis

A vulnerability has been discovered in Libtirpc which could result in denial of service.

Background

Libtirpc is a port of Sun's Transport-Independent RPC library to Linux.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-libs/libtirpc < 1.3.2 >= 1.3.2

Impact

===== Denial of service can be achieved via establishing enough connections to Libtirpc to reach the limit of open file descriptors for the process.

Workaround

There is no known workaround at this time.

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