#VU74476 Allocation of Resources Without Limits or Throttling in envoy - CVE-2023-27492

Vulnerability identifier: #VU74476

Vulnerability risk: Medium

CVSSv4.0: 1.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-27492

CWE-ID: CWE-770

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 when a large request body is processed in Lua filter. A remote user can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

envoy: 1.0.0, 1.1.0 - 1.19.5, 1.2.0 - 1.25.3, 1.3.0, 1.4.0, 1.5.0, 1.6.0, 1.7.0 - 1.7.1, 1.8.0, 1.9.0 - 1.9.1

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External links
https://github.com/envoyproxy/envoy/security/advisories/GHSA-wpc2-2jp6-ppg2
https://github.com/envoyproxy/envoy/releases/tag/v1.25.4
https://github.com/envoyproxy/envoy/releases/tag/v1.24.5
https://github.com/envoyproxy/envoy/releases/tag/v1.23.7
https://github.com/envoyproxy/envoy/releases/tag/v1.22.10

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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