[17239] in Kerberos-V5-bugs
[krbdev.mit.edu #9259] git commit
daemon@ATHENA.MIT.EDU (Greg Hudson via RT)
Mon Nov 9 12:03:05 2026
From: "Greg Hudson via RT" <rt@krbdev.mit.edu>
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Date: Mon, 09 Nov 2026 12:02:59 -0500
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<URL: https://krbdev.mit.edu/rt/Ticket/Display.html?id=9259 >
Check PAC server checksum verification result
In verify_pac_checksums(), stop if the server checksum does not
verify. In krb5_pac_verify_ext(), validate the client principal
before the checksums, so that a client mismatch does not leave the PAC
marked as verified. Add a test case.
CVE-2026-111423:
In MIT krb5 release 1.21 and later, server applications will
erroneously treat the PAC within a ticket as verified when the server
checksum is invalid.
[ghudson@mit.edu: edited commit message]
(cherry picked from commit ffb49b20a30c01ac799e2444542fc9dc748ff8db)
https://github.com/krb5/krb5/commit/ba3f7e11e7bb3f1ef1a6deb5ea9cb6ffc7546e84
Author: Alejandro Pacheco <alepacheco99@gmail.com>
Committer: Greg Hudson <ghudson@mit.edu>
Commit: ba3f7e11e7bb3f1ef1a6deb5ea9cb6ffc7546e84
Branch: krb5-1.22
src/lib/krb5/krb/pac.c | 14 +++++---
src/lib/krb5/krb/t_pac.c | 84 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 93 insertions(+), 5 deletions(-)
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