#VU33604 OS Command Injection - CVE-2015-8557

Vulnerability identifier: #VU33604

Vulnerability risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2015-8557

CWE-ID: CWE-78

Exploitation vector: Network

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

The FontManager._get_nix_font_path function in formatters/img.py in Pygments 1.2.2 through 2.0.2 allows remote attackers to execute arbitrary commands via shell metacharacters in a font name.

Mitigation
Install update from vendor's website.

External links
https://packetstormsecurity.com/files/133823/Pygments-FontManager._get_nix_font_path-Shell-Injection.html
https://seclists.org/fulldisclosure/2015/Oct/4
https://www.debian.org/security/2016/dsa-3445
https://www.openwall.com/lists/oss-security/2015/12/14/17
https://www.openwall.com/lists/oss-security/2015/12/14/6
https://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
https://www.ubuntu.com/usn/USN-2862-1
https://bitbucket.org/birkenfeld/pygments-main/pull-requests/501/fix-shell-injection-in/diff
https://security.gentoo.org/glsa/201612-05

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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.