A vulnerability was found in mod_wsgi. The X-Client-IP header is not removed from a request from an untrusted proxy, allowing an attacker to pass the X-Client-IP header to the target WSGI application because the condition to remove it is missing.

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-2255
• https://github.com/GrahamDumpleton/mod_wsgi/blob/4.9.2/src/server/mod_wsgi.c#L13940-L13941
• https://github.com/GrahamDumpleton/mod_wsgi/blob/4.9.2/src/server/mod_wsgi.c#L14046-L14082
• https://modwsgi.readthedocs.io/en/latest/release-notes/version-4.9.3.html
• GrahamDumpleton/mod_wsgi@af3c0c2
• https://github.com/pypa/advisory-database/tree/main/vulns/mod-wsgi/PYSEC-2022-254.yaml
• https://lists.debian.org/debian-lts-announce/2022/09/msg00021.html