From 05c544eef3633b774ca38154ba4c2bf3416b471b Mon Sep 17 00:00:00 2001 From: Tom Yu Date: Mon, 4 Nov 2013 15:33:09 -0500 Subject: [PATCH] Multi-realm KDC null deref [CVE-2013-1418] If a KDC serves multiple realms, certain requests can cause setup_server_realm() to dereference a null pointer, crashing the KDC. CVSSv2: AV:N/AC:M/Au:N/C:N/I:N/A:P/E:POC/RL:OF/RC:C A related but more minor vulnerability requires authentication to exploit, and is only present if a third-party KDC database module can dereference a null pointer under certain conditions. (back ported from commit 5d2d9a1abe46a2c1a8614d4672d08d9d30a5f8bf) ticket: 7756 (new) version_fixed: 1.11.4 status: resolved --- src/kdc/main.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/src/kdc/main.c b/src/kdc/main.c index 1624046dd7..8a085a2cc1 100644 --- a/src/kdc/main.c +++ b/src/kdc/main.c @@ -125,6 +125,9 @@ setup_server_realm(struct server_handle *handle, krb5_principal sprinc) int kdc_numrealms = handle->kdc_numrealms; kret = 0; + if (sprinc == NULL) + return NULL; + if (kdc_numrealms > 1) { if (!(newrealm = find_realm_data(handle, sprinc->realm.data, (krb5_ui_4) sprinc->realm.length))) -- 2.47.3