diff options
Diffstat (limited to 'source/n')
| -rw-r--r-- | source/n/krb5/d775c95af7606a51bf79547a94fa52ddd1cb7f49.patch | 43 | ||||
| -rwxr-xr-x | source/n/krb5/krb5.SlackBuild | 4 |
2 files changed, 46 insertions, 1 deletions
diff --git a/source/n/krb5/d775c95af7606a51bf79547a94fa52ddd1cb7f49.patch b/source/n/krb5/d775c95af7606a51bf79547a94fa52ddd1cb7f49.patch new file mode 100644 index 000000000..7623d8292 --- /dev/null +++ b/source/n/krb5/d775c95af7606a51bf79547a94fa52ddd1cb7f49.patch @@ -0,0 +1,43 @@ +From d775c95af7606a51bf79547a94fa52ddd1cb7f49 Mon Sep 17 00:00:00 2001 +From: Greg Hudson <ghudson@mit.edu> +Date: Tue, 3 Aug 2021 01:15:27 -0400 +Subject: [PATCH] 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. + +ticket: 9008 (new) +tags: pullup +target_version: 1.19-next +target_version: 1.18-next +--- + src/kdc/do_tgs_req.c | 5 +++++ + 1 file changed, 5 insertions(+) + +diff --git a/src/kdc/do_tgs_req.c b/src/kdc/do_tgs_req.c +index 582e497cc9..32dc65fa8e 100644 +--- a/src/kdc/do_tgs_req.c ++++ b/src/kdc/do_tgs_req.c +@@ -204,6 +204,11 @@ process_tgs_req(krb5_kdc_req *request, krb5_data *pkt, + status = "FIND_FAST"; + goto cleanup; + } ++ if (sprinc == NULL) { ++ status = "NULL_SERVER"; ++ errcode = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN; ++ goto cleanup; ++ } + + errcode = get_local_tgt(kdc_context, &sprinc->realm, header_server, + &local_tgt, &local_tgt_storage, &local_tgt_key); diff --git a/source/n/krb5/krb5.SlackBuild b/source/n/krb5/krb5.SlackBuild index fbc5123a4..e39bf7ed0 100755 --- a/source/n/krb5/krb5.SlackBuild +++ b/source/n/krb5/krb5.SlackBuild @@ -26,7 +26,7 @@ cd $(dirname $0) ; CWD=$(pwd) PKGNAM=krb5 VERSION=${VERSION:-$(echo $PKGNAM-*.tar.?z | rev | cut -f 3- -d . | cut -f 1 -d - | rev)} -BUILD=${BUILD:-1} +BUILD=${BUILD:-2} if [ -z "$ARCH" ]; then case "$( uname -m )" in @@ -79,6 +79,8 @@ find . \ sed -i "/KRB5ROOT=/s/\/local//" src/util/ac_check_krb5.m4 +cat $CWD/d775c95af7606a51bf79547a94fa52ddd1cb7f49.patch | patch -p1 --verbose || exit 1 + cd src CFLAGS="$SLKCFLAGS" \ |