#VU33343 Heap-based buffer overflow in libbsd - CVE-2016-2090

Vulnerability identifier: #VU33343

Vulnerability risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2016-2090

CWE-ID: CWE-122

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libbsd
Other software / Other software solutions

Vendor: libbsd.freedesktop.org

Description

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

Off-by-one vulnerability in the fgetwln() function in libbsd before 0.8.2 allows attackers to have unspecified impact via unknown vectors, which trigger a heap-based buffer overflow.

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

Mitigation
Install update from vendor's website.

Vulnerable software versions

libbsd: 0.8.0 - 0.8.1

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External links
https://www.openwall.com/lists/oss-security/2016/01/28/5
https://blog.fuzzing-project.org/36-Heap-buffer-overflow-in-fgetwln-function-of-libbsd.html
https://bugs.freedesktop.org/show_bug.cgi?id=93881
https://cgit.freedesktop.org/libbsd/commit/?id=c8f0723d2b4520bdd6b9eb7c3e7976de726d7ff7
https://lists.debian.org/debian-lts-announce/2019/12/msg00036.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7KJE5SPSX7HEKLZ34LUTZLXWPEL2K353/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DIQKQ42Z7553D46QY3IMIQKS52QTNIHY/
https://security.gentoo.org/glsa/201607-13
https://usn.ubuntu.com/4243-1/

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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.