#VU88180 Resource exhaustion in envoy - CVE-2024-27919

Vulnerability identifier: #VU88180

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2024-27919

CWE-ID: CWE-400

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 a denial of service (DoS) attack.

The vulnerability exists due to insufficient limitations in oghttp codec placed on the amount of CONTINUATION frames that can be sent within a single HTTP/2 stream. A remote attacker can send a sequence of CONTINUATION frames without the END_HEADERS bit set causing unlimited memory consumption.

Mitigation
Install update from vendor's website.

Vulnerable software versions

envoy: 1.29.0 - 1.29.1

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External links
https://github.com/envoyproxy/envoy/security/advisories/GHSA-gghf-vfxp-799r
https://github.com/envoyproxy/envoy/commit/57a02565532c18eb9df972a3e8974be3ae59f2d5

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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.