[16825] in Kerberos-V5-bugs
[krbdev.mit.edu #9008] git commit
daemon@ATHENA.MIT.EDU (Greg Hudson via RT)
Mon Mar 14 16:14:10 2022
From: "Greg Hudson via RT" <rt@krbdev.mit.edu>
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Date: Mon, 14 Mar 2022 16:13:51 -0400
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<URL: https://krbdev.mit.edu/rt/Ticket/Display.html?id=9008 >
Fix KDC null deref on TGS inner body null server
After the KDC decodes a FAST inner body, it does not check for a null
server. Prior to commit 39548a5b17bbda9eeb63625a201cfd19b9de1c5b this
would typically result in an error from krb5_unparse_name(), but with
the addition of get_local_tgt() it results in a null dereference. Add
a null check.
Reported by Joseph Sutton of Catalyst.
CVE-2021-37750:
In MIT krb5 releases 1.14 and later, an authenticated attacker can
cause a null dereference in the KDC by sending a FAST TGS request with
no server field.
(cherry picked from commit d775c95af7606a51bf79547a94fa52ddd1cb7f49)
https://github.com/krb5/krb5/commit/f5162aa63fb7652eae2ad74be4c3bdf869c0d1f7
Author: Greg Hudson <ghudson@mit.edu>
Commit: f5162aa63fb7652eae2ad74be4c3bdf869c0d1f7
Branch: krb5-1.19
src/kdc/do_tgs_req.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
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