Denial of service in GNU libmicrohttpd

1) Input validation error

EUVDB-ID: #VU74198

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-27371

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of multipart/form-data data within the MHD_create_post_processor() method in the postprocessor.c. A remote attacker can send a specially crafted HTTP POST request to the server and perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

GNU Libmicrohttpd: 0.9.16 - 0.9.75

External links

http://github.com/0xhebi/CVEs/tree/main/GNU%20Libmicrohttpd
http://git.gnunet.org/libmicrohttpd.git/commit/?id=6d6846e20bfdf4b3eb1b592c97520a532f724238
http://lists.gnu.org/archive/html/libmicrohttpd/2023-02/msg00000.html

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.