GLSA 201708-05: RAR and UnRAR: User-assisted execution of arbitrary code

Severity:normal
Title:RAR and UnRAR: User-assisted execution of arbitrary code
Date:08/21/2017
Bugs: #622342, #622382
ID:201708-05

Synopsis

An integer overflow in RAR and UnRAR might allow remote attackers to execute arbitrary code.

Background

RAR and UnRAR provide command line interfaces for compressing and decompressing RAR files.

Affected packages

Package Vulnerable Unaffected Architecture(s)
app-arch/unrar < 5.5.5 >= 5.5.5 All supported architectures
app-arch/rar < 5.5.0_beta4_p20170628 >= 5.5.0_beta4_p20170628 All supported architectures

Description

A VMSF_DELTA memory corruption was discovered in which an integer overflow can be caused in DataSize+CurChannel. The result is a negative value of the “DestPos” variable which allows writing out of bounds when setting Mem[DestPos].

Impact

A remote attacker, by enticing a user to open a specially crafted archive, could execute arbitrary code with the privileges of the process.

Workaround

There is no known workaround at this time.

Resolution

All RAR users should upgrade to the latest version:

      # emerge --sync
      # emerge --ask --oneshot --verbose
      ">=app-arch/rar-5.5.0_beta4_p20170628"
    

All UnRAR users should upgrade to the latest version:

# emerge --sync # emerge --ask --oneshot --verbose ">=app-arch/unrar-5.5.5"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-201708-05.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!