[krbdev.mit.edu #9099] git commit

[Greg Hudson via RT]

<URL: https://krbdev.mit.edu/rt/Ticket/Display.html?id=9099 >


Ensure array count consistency in kadm5 RPC

In _xdr_kadm5_principal_ent_rec(), ensure that n_key_data matches the
key_data array count when decoding.  Otherwise when the structure is
later freed, xdr_array() could iterate over the wrong number of
elements, either leaking some memory or freeing uninitialized
pointers.  Reported by Robert Morris.

CVE-2023-36054:

An authenticated attacker can cause a kadmind process to crash by
freeing uninitialized pointers.  Remote code execution is unlikely.
An attacker with control of a kadmin server can cause a kadmin client
to crash by freeing uninitialized pointers.

(cherry picked from commit ef08b09c9459551aabbe7924fb176f1583053cdd)

https://github.com/krb5/krb5/commit/c81ffb6c8578a9b55c9d0a10342b5bc1bc6ec4df
Author: Greg Hudson <ghudson at mit.edu>
Commit: c81ffb6c8578a9b55c9d0a10342b5bc1bc6ec4df
Branch: krb5-1.20
 src/lib/kadm5/kadm_rpc_xdr.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)