#VU90991 Stack-based buffer overflow in nginx and NGINX Plus - CVE-2024-31079

Vulnerability identifier: #VU90991

Vulnerability risk: Medium

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2024-31079

CWE-ID: CWE-121

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
nginx
Server applications / Web servers
NGINX Plus
Server applications / Web servers

Vendor: NGINX
F5 Networks

Description

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

The vulnerability exists due to a boundary error when HTTP/3 requests within the HTTP/3 QUIC module
 (ngx_http_v3_module). A remote attacker can send specially crafted requests to the web server, trigger a stack-based buffer overflow and perform a denial of service (DoS) attack.

This attack requires that a request be specifically timed during the connection draining process, which the attacker has no visibility and limited influence over.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

nginx: 1.25.0 - 1.26.0

NGINX Plus: R30 P1 - R30, R31 P1 - R31

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External links
https://my.f5.com/manage/s/article/K000139611
https://mailman.nginx.org/pipermail/nginx-announce/2024/GMY32CSHFH6VFTN76HJNX7WNEX4RLHF6.html

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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.