Vulnerability identifier: #VU32264

Vulnerability risk: Medium

CVSSv3.1: 6.8 [AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-4302

CWE-ID: CWE-122

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
libarchive
Client/Desktop applications / Software for archiving

Vendor: libarchive

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in Heap-based buffer overflow in the parse_codes function in archive_read_support_format_rar.c in libarchive before 3.2.1. A remote attacker can use a RAR file with a zero-sized dictionary. to trigger heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Update to version 3.2.1.

Vulnerable software versions

libarchive: 3.2.0

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External links
http://blog.talosintel.com/2016/06/the-poisoned-archives.html
http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=1348444
http://rhn.redhat.com/errata/RHSA-2016-1844.html
http://www.debian.org/security/2016/dsa-3657
http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
http://www.securityfocus.com/bid/91331
http://www.talosintel.com/reports/TALOS-2016-0154/
http://github.com/libarchive/libarchive/commit/05caadc7eedbef471ac9610809ba683f0c698700
http://github.com/libarchive/libarchive/issues/719
http://security.gentoo.org/glsa/201701-03

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.