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author | Yi Zhao <yi.zhao@windriver.com> | 2021-09-10 11:52:48 +0800 |
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committer | Khem Raj <raj.khem@gmail.com> | 2021-09-10 06:57:43 -0700 |
commit | 32140218a8026016687c7017a82113b0b45cf1a6 (patch) | |
tree | 84a10858784527113f63b9f6c072d245c83c1bf1 /meta-oe/recipes-connectivity/krb5/krb5/CVE-2021-37750.patch | |
parent | cebf01f326de251a94f6944b6d06019d673893ae (diff) | |
download | meta-openembedded-contrib-32140218a8026016687c7017a82113b0b45cf1a6.tar.gz |
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>
Diffstat (limited to 'meta-oe/recipes-connectivity/krb5/krb5/CVE-2021-37750.patch')
-rw-r--r-- | meta-oe/recipes-connectivity/krb5/krb5/CVE-2021-37750.patch | 53 |
1 files changed, 53 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 + |