Input validation error in GNU Bash

1) Input validation error

EUVDB-ID: #VU39367

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-5932

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a local authenticated user to execute arbitrary code.

The path autocompletion feature in Bash 4.4 allows local users to gain privileges via a crafted filename starting with a " (double quote) character and a command substitution metacharacter.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Bash: 4.4

External links

http://git.savannah.gnu.org/cgit/bash.git/commit/?id=4f747edc625815f449048579f6e65869914dd715
http://www.openwall.com/lists/oss-security/2017/02/08/3
http://www.securityfocus.com/bid/96136
http://lists.gnu.org/archive/html/bug-bash/2017-01/msg00034.html

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.