PT-2023-3901 · Envoy · Envoy
Alyssawilk
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Published
2023-07-25
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Updated
2024-03-06
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CVE-2023-35944
CVSS v2.0
8.5
High
| Vector | AV:N/AC:L/Au:N/C:C/I:P/A:N |
Name of the Vulnerable Software and Affected Versions
Envoy versions prior to 1.27.0
Envoy versions prior to 1.26.4
Envoy versions prior to 1.25.9
Envoy versions prior to 1.24.10
Envoy versions prior to 1.23.12
Description
The issue is related to the handling of mixed-case schemes in HTTP/2 by Envoy, an open source edge and service proxy. Some internal scheme checks are case-sensitive, which can lead to the rejection of requests with mixed-case schemes, such as
htTp or htTps, or the bypassing of some requests, like https in unencrypted connections. This can potentially allow a remote attacker to access protected data.Recommendations
For versions prior to 1.27.0, update to version 1.27.0 or later.
For versions prior to 1.26.4, update to version 1.26.4 or later.
For versions prior to 1.25.9, update to version 1.25.9 or later.
For versions prior to 1.24.10, update to version 1.24.10 or later.
For versions prior to 1.23.12, update to version 1.23.12 or later.
Exploit
Fix
HTTP Request/Response Smuggling
RCE
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Related Identifiers
Affected Products
Envoy