Remote denial of service in nghttp2

1) Resource exhaustion

EUVDB-ID: #VU81728

Risk: High

CVSSv4.0: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2023-44487

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: Yes

Description

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

The vulnerability exists due to improperly control of consumption for internal resources when handling HTTP/2 requests with compressed HEADERS frames. A remote attacker can send a sequence of compressed HEADERS frames followed by RST_STREAM frames and perform a denial of service (DoS) attack, a.k.a. "Rapid Reset".

Note, the vulnerability is being actively exploited in the wild.

Mitigation

Install update from vendor's website.

Vulnerable software versions

nghttp2: 1.0.0 - 1.56.0

CPE2.3

• cpe:2.3:a:nghttp2:nghttp2:1.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:nghttp2:nghttp2:1.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:nghttp2:nghttp2:1.0.2:*:*:*:*:*:*:*

External links

https://github.com/nghttp2/nghttp2/releases/tag/v1.57.0
https://github.com/nghttp2/nghttp2/security/advisories/GHSA-vx74-f528-fxqg

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?

Yes. This vulnerability is being exploited in the wild.