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CVE-2023-27492

MEDIUMCVSS 6.5/10EPSS 0.69%

Last modified

CVE-2023-27492 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, the Lua filter is vulnerable to denial of service. EPSS estimates a 0.69% chance of exploitation in the next 30 days.

Description

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, the Lua filter is vulnerable to denial of service. Attackers can send large request bodies for routes that have Lua filter enabled and trigger crashes. As of versions versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, Envoy no longer invokes the Lua coroutine if the filter has been reset. As a workaround for those whose Lua filter is buffering all requests/ responses, mitigate by using the buffer filter to avoid triggering the local reply in the Lua filter.

Metrics

CVSS 3.1
6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
0.69%

47.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
EnvoyproxyEnvoy< 1.22.9
EnvoyproxyEnvoy>= 1.23.0, < 1.23.6
EnvoyproxyEnvoy>= 1.24.0, < 1.24.4
EnvoyproxyEnvoy>= 1.25.0, < 1.25.3

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2023-27492?
Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, the Lua filter is vulnerable to denial of service. Attackers can send large request bodies for routes that have Lua filter enabled and trigger crashes. As of versions versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, Envoy no longer invokes the Lua coroutine if the filter has been reset. As a workaround for those whose Lua filter is buffering all requests/ responses, mitigate by using the buffer filter to avoid triggering the local reply in the Lua filter.
How severe is CVE-2023-27492?
CVE-2023-27492 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.69% probability of exploitation in the next 30 days.
How do I fix CVE-2023-27492?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-27492?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST