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Gentoo: GLSA-202108-45 High: Shadow Security Flaw Detected

gentoo
Calendar Grey August 25, 2020
Dist Gentoo Esm H88
Various vulnerabilities in shadow utilities can lead to privilege elevation on Gentoo systems. Ensure you upgrade to the most recent version to safeguard your system.
Multiple Shadow utilities were installed with setuid permissions, allowing possible root privilege escalation.

Summary

When Shadow was installed with the PAM use flag, setuid binaries provided by Shadow were not properly restricted.

Topics%20covered

Topics Covered

security advisory gentoo privilege escalation high shadow utilities

Resolution

All Shadow users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=sys-apps/shadow-4.8-r3"

References

[ 1 ] CVE-2019-19882 https://nvd.nist.gov/vuln/detail/CVE-2019-19882 [ 2 ] Upstream mitigation https://github.com/shadow-maint/shadow/pull/199

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/202008-09
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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: High
Title: Shadow: Privilege escalation
Date: August 25, 2020
Bugs: #702252
ID: 202008-09

Topics%20covered

Topics Covered

security advisory gentoo privilege escalation high shadow utilities

Synopsis

Multiple Shadow utilities were installed with setuid permissions, allowing possible root privilege escalation.

Background

Shadow is a set of tools to deal with user accounts.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 sys-apps/shadow < 4.8-r3 >= 4.8-r3

Impact

===== A local attacker could escalate privileges to root.

Workaround

There is no known workaround at this time.

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