Buffer overflow in GNU Libmicrohttpd - CVE-2021-3466
Published: May 5, 2021
Vulnerability identifier: #VU52879
CSH Severity: High
CVSS v4: 9.3 [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]
CVE-ID: CVE-2021-3466
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
GNU Libmicrohttpd
Gentoo Linux
Fedora
libmicrohttpd
Gentoo Linux
Fedora
libmicrohttpd
How to mitigate CVE-2021-3466
Install updates from vendor's website.
GNU Libmicrohttpd - update to 0.9.71
libmicrohttpd - addressed in versions 0.9.73-1.fc32, 0.9.73-1.fc33, 0.9.73-1.fc34
libmicrohttpd - addressed in versions 0.9.73-1.fc32, 0.9.73-1.fc33, 0.9.73-1.fc34
External References
- 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/