#VU52879 Buffer overflow in GNU Libmicrohttpd - CVE-2021-3466

Vulnerability identifier: #VU52879

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-3466

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
GNU Libmicrohttpd
Other software / Other software solutions

Vendor: GNU

Description

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

The vulnerability exists due to a boundary error within the post_process_urlencoded () function. A remote attacker can create a specially crafted HTTP POST request to the application, trigger memory corruption and execute arbitrary code on the target system.

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

Mitigation
Install updates from vendor's website.

Vulnerable software versions

GNU Libmicrohttpd: 0.9.16 - 0.9.70

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External links
https://bugzilla.redhat.com/show_bug.cgi?id=1939127
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4334XJNDJPYQNFE6S3S2KUJJ7TMHYCWL/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/K5NEPVGP3L2CZHLZ4UB44PEILHKPDBOG/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/75HDMREKITMGPGE62NP7KE62ZJVLETXN/

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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.