[krbdev.mit.edu #9209] git commit

[Greg Hudson via RT]

Sat May 16 18:37:04 2026: Request 9209 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=9209 >



Validate lengths when deserializing

When unmarshalling data structures using the krb5_ser_ functions,
bound-check lengths (including array counts) against the remaining
number of bytes to prevent large allocations, integer overflows, and a
potential read overrun in mspac_internalize().  Add an internal helper
function k5_ser_unpack_len() for this purpose.

[ghudson at mit.edu: added helper; added bounds checks for additional
lengths; rewrote commit message]

https://github.com/krb5/krb5/commit/63ae6a8d99ce89258d732f7561233f60df533fa9
Author: TristanInSec <tristan.mtn at gmail.com>
Committer: Greg Hudson <ghudson at mit.edu>
Commit: 63ae6a8d99ce89258d732f7561233f60df533fa9
Branch: master
 src/include/k5-int.h                      |  3 +++
 src/lib/gssapi/krb5/ser_sctx.c            |  6 ++++++
 src/lib/krb5/krb/authdata.c               |  5 ++---
 src/lib/krb5/krb/pac.c                    | 13 ++++++-------
 src/lib/krb5/krb/ser_actx.c               |  5 ++---
 src/lib/krb5/krb/ser_adata.c              | 13 ++++++-------
 src/lib/krb5/krb/ser_addr.c               | 12 ++++++------
 src/lib/krb5/krb/ser_auth.c               | 15 +++++----------
 src/lib/krb5/krb/ser_cksum.c              | 14 ++++++--------
 src/lib/krb5/krb/ser_ctx.c                | 18 +++++++++---------
 src/lib/krb5/krb/ser_key.c                | 11 +++++------
 src/lib/krb5/krb/ser_princ.c              | 11 +++++------
 src/lib/krb5/krb/serialize.c              | 18 ++++++++++++++++++
 src/lib/krb5/libkrb5.exports              |  1 +
 src/plugins/authdata/greet_client/greet.c |  2 ++
 15 files changed, 82 insertions(+), 65 deletions(-)