CVE-2023-25725 Information

Description

HAProxy before 2.7.3 may allow a bypass of access control because HTTP/1 headers are inadvertently lost in some situations aka equest smuggling.\ The HTTP header parsers in HAProxy may accept empty header field names which could be used to truncate the list of HTTP headers and thus make some headers disappear after being parsed and processed for HTTP/1.0 and HTTP/1.1. For HTTP/2 and HTTP/3 the impact is limited because the headers disappear before being parsed and processed as if they had not been sent by the client. The fixed versions are 2.7.3 2.6.9 2.5.12 2.4.22 2.2.29 and 2.0.31.

Reference

https://www.haproxy.org/ https://git.haproxy.org/?p=haproxy-2.7.git;a=commit;h=a0e561ad7f29ed50c473f5a9da664267b60d1112 https://lists.debian.org/debian-lts-announce/2023/02/msg00012.html