GLSA 201709-12: Perl: Race condition vulnerability

Severity:normal
Title:Perl: Race condition vulnerability
Date:09/17/2017
Bugs: #620304
ID:201709-12

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.

Affected packages

Package Vulnerable Unaffected Architecture(s)
virtual/perl-File-Path < 2.130.0 >= 2.130.0 All supported architectures
perl-core/File-Path < 2.130.0 >= 2.130.0 All supported architectures
dev-lang/perl < 5.24.1-r2 >= 5.24.1-r2 All supported architectures

Description

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.

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.

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

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-201709-12.xml

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.

License

Copyright 2010 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.

Thank you!