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Gentoo: GLSA-201708-05 Normal: RAR Integer Overflow Execution Risk

gentoo
Calendar Grey August 21, 2017
Dist Gentoo Esm H88
Cunning adversaries could leverage the integer overflow vulnerabilities in RAR and UnRAR to gain unauthorized access and run malicious code on Gentoo platforms.
An integer overflow in RAR and UnRAR might allow remote attackers to execute arbitrary code.

Summary

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].

Topics%20covered

Topics Covered

security advisory gentoo arbitrary code execution risk normal

Resolution

All RAR users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot -v ">=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

[ 1 ] CVE-2012-6706 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2012-6706

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/201708-05
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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: RAR and UnRAR: User-assisted execution of arbitrary code
Date: August 21, 2017
Bugs: #622342, #622382
ID: 201708-05

Topics%20covered

Topics Covered

security advisory gentoo arbitrary code execution risk normal

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.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 app-arch/rar < 5.5.0_beta4_p20170628>= 5.5.0_beta4_p20170628 2 app-arch/unrar < 5.5.5 >= 5.5.5 ------------------------------------------------------------------- 2 affected packages

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.