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CVE-2023-25725

Published: 14 February 2023

HAProxy before 2.7.3 may allow a bypass of access control because HTTP/1 headers are inadvertently lost in some situations, aka "request 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.

Priority

Medium

Cvss 3 Severity Score

9.1

Score breakdown

Status

Package Release Status
haproxy
Launchpad, Ubuntu, Debian
trusty Ignored
(end of standard support)
upstream Needs triage

bionic
Released (1.8.8-1ubuntu0.13)
focal
Released (2.0.29-0ubuntu1.3)
jammy
Released (2.4.18-0ubuntu1.2)
kinetic
Released (2.4.18-1ubuntu1.2)
lunar
Released (2.6.9-1ubuntu1)
xenial Needed

mantic
Released (2.6.9-1ubuntu1)

Severity score breakdown

Parameter Value
Base score 9.1
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H