CVE-2023-35944: Envoy vulnerable to incorrect handling of HTTP requests and responses with mixed case schemes
First published: Tue Jun 27 2023(Updated: )
Envoy is an open source edge and service proxy designed for cloud-native applications. Envoy allows mixed-case schemes in HTTP/2, however, some internal scheme checks are case-sensitive. Prior to versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12, this can lead to the rejection of requests with mixed-case schemes such as `htTp` or `htTps`, or the bypassing of some requests such as `https` in unencrypted connections. With a fix in versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12, Envoy will now lowercase scheme values by default, and change the internal scheme checks that were case-sensitive to be case-insensitive. There are no known workarounds for this issue.
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Envoyproxy Envoy | >=1.23.0<1.23.12 | |
| Envoyproxy Envoy | >=1.24.0<1.24.10 | |
| Envoyproxy Envoy | >=1.25.0<1.25.9 | |
| Envoyproxy Envoy | >=1.26.0<1.26.4 | |
| redhat/envoy | <1.26.3 | 1.26.3 |
| redhat/envoy | <1.25.8 | 1.25.8 |
| redhat/envoy | <1.24.9 | 1.24.9 |
| redhat/envoy | <1.23.11 | 1.23.11 |
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Reference Links
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-pvgm-7jpg-pw5g
- https://access.redhat.com/errata/RHSA-2023:4624
- https://access.redhat.com/errata/RHSA-2023:4625
- https://access.redhat.com/security/cve/cve-2023-35944
- https://access.redhat.com/errata/RHSA-2023:5175
- https://bugzilla.redhat.com/show_bug.cgi?id=2217985
Frequently Asked Questions
What is CVE-2023-35944?
CVE-2023-35944 is a vulnerability in Envoy, an open source edge and service proxy.
What is the severity of CVE-2023-35944?
CVE-2023-35944 has a severity score of 5.3, which is considered high.
How does CVE-2023-35944 affect Envoy?
CVE-2023-35944 allows mixed-case schemes in HTTP/2, but some internal scheme checks are case-sensitive, which can lead to the rejection of certain requests.
Which versions of Envoy are affected by CVE-2023-35944?
Versions 1.24.0 to 1.24.10, 1.25.0 to 1.25.9, 1.26.0 to 1.26.4, and 1.23.0 to 1.23.12 of Envoy are affected by CVE-2023-35944.
How can I fix CVE-2023-35944?
To fix CVE-2023-35944, update Envoy to version 1.24.10, 1.25.9, 1.26.4, or 1.23.12.
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