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Gentoo: GLSA-201709-12 Normal: Perl Race Condition Threat

gentoo
Calendar Grey September 17, 2017
Dist Gentoo Esm H88
Critical notice for Gentoo Linux regarding a security flaw in Perl's File::Path module due to a concurrency issue. Immediate upgrade is advised.
A vulnerability in module File::Path for Perl allows local attackers to set arbitrary mode values on arbitrary files bypassing security restrictions

Summary

A race condition occurs within concurrent environments. This condition was discovered by The cPanel Security Team in the rmtree and remove_tree functions in the File-Path module before 2.13 for Perl. This is due to the time-of-check-to-time-of-use (TOCTOU) race condition between the stat() that decides the inode is a directory and the chmod() that tries to make it user-rwx.

Topics%20covered

Topics Covered

security advisory gentoo race condition perl local attack normal severity file path

Resolution

All Perl users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=dev-lang/perl-5.24.1-r2"
All File-Path users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=perl-core/File-Path-2.130.0"
All Perl-File-Path users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=virtual/perl-File-Path-2.130.0"

References

[ 1 ] CVE-2017-6512 https://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-6512

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/201709-12
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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: Perl: Race condition vulnerability
Date: September 17, 2017
Bugs: #620304
ID: 201709-12

Topics%20covered

Topics Covered

security advisory gentoo race condition perl local attack normal severity file path

Synopsis

A vulnerability in module File::Path for Perl allows local attackers to set arbitrary mode values on arbitrary files bypassing security restrictions.

Background

File::Path module provides a convenient way to create directories of arbitrary depth and to delete an entire directory subtree from the filesystem.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 dev-lang/perl < 5.24.1-r2 >= 5.24.1-r2 2 perl-core/File-Path < 2.130.0 >= 2.130.0 3 virtual/perl-File-Path < 2.130.0 >= 2.130.0 ------------------------------------------------------------------- 3 affected packages

Impact

===== A local attacker could exploit this condition to set arbitrary mode values on arbitrary files and hence bypass security restrictions.

Workaround

There is no known workaround at this time.