#VU13103 Improper input validation in Bash - CVE-2016-0634

Vulnerability identifier: #VU13103

Vulnerability risk: High

CVSSv4.0: 6.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2016-0634

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Bash
Universal components / Libraries / Scripting languages

Vendor: GNU

Description

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

The vulnerability exists in the expansion of 'h' in the prompt string due to insufficient validation of user-supplied input. A remote attacker can place shell metacharacters in 'hostname' of a machine and execute arbitrary code with elevated privileges.

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

Mitigation
Install update from vendor's website.

Vulnerable software versions

Bash: 4.3

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External links
https://bugzilla.redhat.com/show_bug.cgi?id=1377613

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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