[17238] in Kerberos-V5-bugs
[krbdev.mit.edu #9252] git commit
daemon@ATHENA.MIT.EDU (Greg Hudson via RT)
Mon Nov 9 12:03:00 2026
From: "Greg Hudson via RT" <rt@krbdev.mit.edu>
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Date: Mon, 09 Nov 2026 12:02:55 -0500
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<URL: https://krbdev.mit.edu/rt/Ticket/Display.html?id=9252 >
Enforce lockdown bit in password change server
In schpw_util_wrapper(), reject password changes when the lockdown bit
is set on the target principal. Discovered by Claude and Ada Logics.
CVE-2026-107884:
In MIT krb5 release 1.15 and later, a client with kadmin
administrative privileges can bypass the lockdown_keys attribute by
using the password change protocol instead of the kadmin protocol.
(cherry picked from commit d8248074bbd5c87d6415cba5dbb604a668197e28)
https://github.com/krb5/krb5/commit/2515fb5d3d8eb3577ea60cd14d7216c654718597
Author: Greg Hudson <ghudson@mit.edu>
Commit: 2515fb5d3d8eb3577ea60cd14d7216c654718597
Branch: krb5-1.22
src/kadmin/server/misc.c | 28 +++++++++++++++++++---------
src/kadmin/server/schpw.c | 1 +
2 files changed, 20 insertions(+), 9 deletions(-)
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