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authorYi Zhao <yi.zhao@windriver.com>2021-09-10 11:52:48 +0800
committerKhem Raj <raj.khem@gmail.com>2021-09-10 06:57:43 -0700
commit32140218a8026016687c7017a82113b0b45cf1a6 (patch)
tree84a10858784527113f63b9f6c072d245c83c1bf1
parentcebf01f326de251a94f6944b6d06019d673893ae (diff)
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krb5: fix CVE-2021-37750
CVE-2021-37750: The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field. References: https://nvd.nist.gov/vuln/detail/CVE-2021-37750 Patches from: https://github.com/krb5/krb5/commit/d775c95af7606a51bf79547a94fa52ddd1cb7f49 Signed-off-by: Yi Zhao <yi.zhao@windriver.com> Signed-off-by: Khem Raj <raj.khem@gmail.com>
-rw-r--r--meta-oe/recipes-connectivity/krb5/krb5/CVE-2021-37750.patch53
-rw-r--r--meta-oe/recipes-connectivity/krb5/krb5_1.17.2.bb1
2 files changed, 54 insertions, 0 deletions
diff --git a/meta-oe/recipes-connectivity/krb5/krb5/CVE-2021-37750.patch b/meta-oe/recipes-connectivity/krb5/krb5/CVE-2021-37750.patch
new file mode 100644
index 0000000000..c67bca32e7
--- /dev/null
+++ b/meta-oe/recipes-connectivity/krb5/krb5/CVE-2021-37750.patch
@@ -0,0 +1,53 @@
+From b3999be7ab59a5af4b2f1042ce0d6b03ecb17d4e 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
+
+CVE: CVE-2021-37750
+
+Upstream-Status: Backport
+[https://github.com/krb5/krb5/commit/d775c95af7606a51bf79547a94fa52ddd1cb7f49]
+
+Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
+---
+ 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 587342a..622b48f 100644
+--- a/src/kdc/do_tgs_req.c
++++ b/src/kdc/do_tgs_req.c
+@@ -201,6 +201,11 @@ 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);
+--
+2.17.1
+
diff --git a/meta-oe/recipes-connectivity/krb5/krb5_1.17.2.bb b/meta-oe/recipes-connectivity/krb5/krb5_1.17.2.bb
index 197c1e096b..6e0b2fdacb 100644
--- a/meta-oe/recipes-connectivity/krb5/krb5_1.17.2.bb
+++ b/meta-oe/recipes-connectivity/krb5/krb5_1.17.2.bb
@@ -31,6 +31,7 @@ SRC_URI = "http://web.mit.edu/kerberos/dist/${BPN}/${SHRT_VER}/${BP}.tar.gz \
file://krb5-kdc.service \
file://krb5-admin-server.service \
file://CVE-2021-36222.patch;striplevel=2 \
+ file://CVE-2021-37750.patch;striplevel=2 \
"
SRC_URI[md5sum] = "aa4337fffa3b61f22dbd0167f708818f"
SRC_URI[sha256sum] = "1a4bba94df92f6d39a197a10687653e8bfbc9a2076e129f6eb92766974f86134"