Vulnerability identifier: #VU8605

Vulnerability risk: High

CVSSv3.1: 8.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-12942

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

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

Vendor: RARLAB

Description

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

The vulnerability exists due to boundary error when processing archives in in the Unpack::LongLZ function in libunrar.a in UnRAR before 5.5.7. A remote unauthenticated attacker can create a specially crafted archive, trick the victim into opening it an execute arbitrary code on the target system.

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

Mitigation
Update to version 5.5.7.

Vulnerable software versions

UnRar: 5.5.6

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External links
http://seclists.org/oss-sec/2017/q3/290

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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