Buffer overflow in Envoyproxy Envoy

CVE-2024-45809

Envoy is a cloud-native high-performance edge/middle/service proxy. Jwt filter will lead to an Envoy crash when clear route cache with remote JWKs. In the following case: 1. remote JWKs are used, which requires async header processing; 2. clear_route_cache is enabled on the provider; 3. header operations are enabled in JWT filter, e.g. header to claims feature; 4. the routing table is configured in a way that the JWT header operations modify requests to not match any route. When these conditions are met, a crash is triggered in the upstream code due to nullptr reference conversion from route(). The root cause is the ordering of continueDecoding and clearRouteCache. This issue has been addressed in versions 1.31.2, 1.30.6, and 1.29.9. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Vulnerability class: Buffer Overflow

EPSS: 0.004 (29.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H.

Affected products

  • Envoyproxy Envoy — versions >= 1.29.0, < 1.29.9, >= 1.30.0, < 1.30.6, >= 1.31.0, < 1.31.2

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2024-45809?
CVE-2024-45809 is a medium-severity vulnerability in Envoyproxy Envoy, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.3/10. Published 2024-09-20.
How severe is CVE-2024-45809?
Medium severity. CVSS v3 base score is 5.3 out of 10.