[16778] in Kerberos-V5-bugs
[krbdev.mit.edu #9008] git commit
daemon@ATHENA.MIT.EDU (Greg Hudson via RT)
Thu Aug 19 12:19:59 2021
From: "Greg Hudson via RT" <rt-comment@krbdev.mit.edu>
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Thu Aug 19 12:19:25 2021: Request 9008 was acted upon.
Transaction: Ticket created by ghudson@mit.edu
Queue: krb5
Subject: git commit
Owner: ghudson@mit.edu
Requestors:
Status: new
Ticket <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.
https://github.com/krb5/krb5/commit/d775c95af7606a51bf79547a94fa52ddd1cb7f49
Author: Greg Hudson <ghudson@mit.edu>
Commit: d775c95af7606a51bf79547a94fa52ddd1cb7f49
Branch: master
src/kdc/do_tgs_req.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
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