H2O HTTP Server Vulnerability: Inheritance Confusion Causes Unexpected Header Modification
CVE-2024-25622

4.3MEDIUM

Key Information:

Vendor
H2o
Status
H2o
Vendor
CVE Published:
11 October 2024

Summary

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The configuration directives provided by the headers handler allows users to modify the response headers being sent by h2o. The configuration file of h2o has scopes, and the inner scopes (e.g., path level) are expected to inherit the configuration defined in outer scopes (e.g., global level). However, if a header directive is used in the inner scope, all the definition in outer scopes are ignored. This can lead to headers not being modified as expected. Depending on the headers being added or removed unexpectedly, this behavior could lead to unexpected client behavior. This vulnerability is fixed in commit 123f5e2b65dcdba8f7ef659a00d24bd1249141be.

Affected Version(s)

h2o < 123f5e2b65dcdba8f7ef659a00d24bd1249141be

References

https://github.com/h2o/h2o/security/advisories/GHSA-5m7v-...
x_refsource_CONFIRM
https://github.com/h2o/h2o/issues/3332
x_refsource_MISC
https://github.com/h2o/h2o/commit/123f5e2b65dcdba8f7ef659...
x_refsource_MISC

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.