Remote denial of service in Envoy

1) Resource exhaustion

EUVDB-ID: #VU88180

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-2024-27919

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

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

External links

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.