Vulnerability identifier: #VU78293

Vulnerability 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-2023-35945

CWE-ID: CWE-401

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
envoy
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Cloud Native Computing Foundation

Description
The vulnerability allows a remote attacker to perform DoS attack on the target system.

The vulnerability exists due memory leak when handling HTTP/2 requests within the nghttp2 codec. A remote attacker can send RST_STREAM immediately followed by the GOAWAY frames to the application and force memory leak.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

envoy: 1.23.0 - 1.26.2

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External links
http://github.com/nghttp2/nghttp2/blob/e7f59406556c80904b81b593d38508591bb7523a/lib/nghttp2_session.c#L3346
http://github.com/envoyproxy/envoy/security/advisories/GHSA-jfxv-29pc-x22r

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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.