Envoy vulnerable to HTTP/2 memory leak in nghttp2 codec
CVE-2023-35945

7.5HIGH

Key Information:

Vendor

Envoyproxy

Status
Envoy
Vendor
CVE Published:
13 July 2023

What is CVE-2023-35945?

The Envoy Proxy, utilized for cloud-native edge and service routing, contains a flaw in its HTTP/2 codec that can lead to memory leaks. When an upstream server sends an RST_STREAM followed by GOAWAY frames, the planned cleanup of pending requests does not properly deallocate certain bookkeeping structures or compressed headers. This oversight results in memory exhaustion, causing a denial of service. The affected versions are 1.26.3, 1.25.8, 1.24.9, and 1.23.11, which have been updated to resolve this issue.

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Affected Version(s)

envoy >= 1.26.0, < 1.26.3 < 1.26.0, 1.26.3

envoy >= 1.25.0, < 1.25.8 < 1.25.0, 1.25.8

envoy >= 1.24.0, < 1.24.9 < 1.24.0, 1.24.9

References

https://github.com/envoyproxy/envoy/security/advisories/G...
x_refsource_CONFIRM
https://github.com/nghttp2/nghttp2/blob/e7f59406556c80904...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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