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Gentoo Linux GLSA-202210-26 Normal: Shadow TOCTOU Race Risk

gentoo
Calendar Grey October 30, 2022
Dist Gentoo Esm H88
Uncover a TOCTOU conflict in Illuminate that jeopardizes unapproved data alterations. Remain protected with this warning.
A TOCTOU race has been discovered in Shadow, which could result in the unauthorized modification of files.

Summary

A TOCTOU race condition was discovered in shadow. A local attacker with write privileges in a directory removed or copied by usermod/userdel could potentially exploit this flaw when the administrator invokes usermod/userdel.

Topics%20covered

Topics Covered

security advisory gentoo local attack shadow normal severity file modification toctou race

Resolution

All Shadow users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=sys-apps/shadow-4.12.2"

References

[ 1 ] CVE-2013-4235 https://nvd.nist.gov/vuln/detail/CVE-2013-4235

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/202210-26
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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: Shadow: TOCTOU Race
Date: October 31, 2022
Bugs: #830486
ID: 202210-26

Topics%20covered

Topics Covered

security advisory gentoo local attack shadow normal severity file modification toctou race

Synopsis

A TOCTOU race has been discovered in Shadow, which could result in the unauthorized modification of files.

Background

Shadow contains utilities to deal with user accounts

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 sys-apps/shadow < 4.12.2 >= 4.12.2

Impact

===== An unauthorized user could potentially modify files which they do not have write permissions for.

Workaround

There is no known workaround at this time.

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