[16898] in Kerberos-V5-bugs
[krbdev.mit.edu #9101] git commit
daemon@ATHENA.MIT.EDU (Greg Hudson via RT)
Mon Aug 14 01:59:59 2023
From: "Greg Hudson via RT" <rt@krbdev.mit.edu>
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Date: Mon, 14 Aug 2023 01:59:42 -0400
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<URL: https://krbdev.mit.edu/rt/Ticket/Display.html?id=9101 >
Fix double-free in KDC TGS processing
When issuing a ticket for a TGS renew or validate request, copy only
the server field from the outer part of the header ticket to the new
ticket. Copying the whole structure causes the enc_part pointer to be
aliased to the header ticket until krb5_encrypt_tkt_part() is called,
resulting in a double-free if handle_authdata() fails.
[ghudson@mit.edu: changed the fix to avoid aliasing enc_part rather
than check for aliasing before freeing; rewrote commit message]
CVE-2023-39975:
In MIT krb5 release 1.21, an authenticated attacker can cause a KDC to
free the same pointer twice if it can induce a failure in
authorization data handling.
(cherry picked from commit 88a1701b423c13991a8064feeb26952d3641d840)
https://github.com/krb5/krb5/commit/f4dcb7e442e0f314db5b4f7449aa101cbb28bdd4
Author: Andreas Schneider <asn@samba.org>
Committer: Greg Hudson <ghudson@mit.edu>
Commit: f4dcb7e442e0f314db5b4f7449aa101cbb28bdd4
Branch: krb5-1.21
src/kdc/do_tgs_req.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
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