Impact Clients could clobber values set by intermediate proxies (such as X-Forwarded-For) by providing a underscore version of the same header (X-Forwarded_For). Any users trusting headers set by their proxy may be affected. Attackers may be able to downgrade connections to HTTP (non-SSL) or redirect responses, which could cause confidentiality leaks if combined with a separate MITM attack. Patches v6.4.3/v5.6.9 now discards any headers using underscores if the non-underscore version also exists. Effectively, allowing the proxy defined headers to always win. Workarounds Nginx has a underscores_in_headers configuration variable to discard these headers at the proxy level. Any users that are implicitly trusting the proxy defined headers for security or availability should immediately cease doing so until upgraded to the fixed versions.
The bug has been referenced in the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=62081c0524120d1b1b4a1ab858eb84f0e9e17f9a commit 62081c0524120d1b1b4a1ab858eb84f0e9e17f9a Author: Hans de Graaff <graaff@gentoo.org> AuthorDate: 2024-09-22 05:33:18 +0000 Commit: Hans de Graaff <graaff@gentoo.org> CommitDate: 2024-09-22 05:34:19 +0000 www-servers/puma: add 6.4.3 Bug: https://bugs.gentoo.org/939950 Closes: https://bugs.gentoo.org/939786 Signed-off-by: Hans de Graaff <graaff@gentoo.org> www-servers/puma/Manifest | 1 + www-servers/puma/puma-6.4.3.ebuild | 83 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 84 insertions(+)
The bug has been referenced in the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=622d77b81dbc631fc957590965452b0244a60a76 commit 622d77b81dbc631fc957590965452b0244a60a76 Author: Hans de Graaff <graaff@gentoo.org> AuthorDate: 2024-11-01 09:59:13 +0000 Commit: Hans de Graaff <graaff@gentoo.org> CommitDate: 2024-11-01 09:59:45 +0000 www-servers/puma: drop 6.3.1, 6.4.2 Bug: https://bugs.gentoo.org/939950 Signed-off-by: Hans de Graaff <graaff@gentoo.org> www-servers/puma/Manifest | 2 -- www-servers/puma/puma-6.3.1.ebuild | 67 ------------------------------------- www-servers/puma/puma-6.4.2.ebuild | 68 -------------------------------------- 3 files changed, 137 deletions(-)
