[krbdev.mit.edu #9073] git commit

[Greg Hudson via RT]

Tue Nov 15 11:30:12 2022: Request 9073 was acted upon.
 Transaction: Ticket created by ghudson at mit.edu
       Queue: krb5
     Subject: git commit
       Owner: ghudson at mit.edu
  Requestors: 
      Status: new
 Ticket <URL: https://krbdev.mit.edu/rt/Ticket/Display.html?id=9073 >



Fix null deref in KDC when decoding invalid NDR

In ndr_dec_delegation_info(), keep di->transited_services_length valid
by incrementing it as we add entries.  Otherwise
ndr_free_delegation_info() could dereference a null
di->transited_services field.  Also bound nservices using data->length
to prevent inordinately large memory allocations.  Credit to OSS-Fuzz
for discovering the issues.

https://github.com/krb5/krb5/commit/fa62bd33a0c0889c083999c0289ffa81a5d51e7b
Author: Greg Hudson <ghudson at mit.edu>
Commit: fa62bd33a0c0889c083999c0289ffa81a5d51e7b
Branch: master
 src/kdc/ndr.c   | 14 +++++++-------
 src/kdc/t_ndr.c | 32 +++++++++++++++++++++++++++++---
 2 files changed, 36 insertions(+), 10 deletions(-)