[ GLSA 201708-05 ] RAR and UnRAR

[GLSA]

Gentoo Linux Security Advisory

Title: RAR and UnRAR: User-assisted execution of arbitrary code (GLSA 201708-05)
Severity: normal
Exploitable: remote
Date: 2017-08-21
Bug(s): #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: app-arch/rar
Vulnerable: < 5.5.0_beta4_p20170628
Unaffected: >= 5.5.0_beta4_p20170628
Architectures: All supported architectures

Package: app-arch/unrar
Vulnerable: < 5.5.5
Unaffected: >= 5.5.5
Architectures: 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: