diff options
Diffstat (limited to 'meta-oe/recipes-connectivity/krb5/krb5/CVE-2021-36222.patch')
| -rw-r--r-- | meta-oe/recipes-connectivity/krb5/krb5/CVE-2021-36222.patch | 121 |
1 files changed, 0 insertions, 121 deletions
diff --git a/meta-oe/recipes-connectivity/krb5/krb5/CVE-2021-36222.patch b/meta-oe/recipes-connectivity/krb5/krb5/CVE-2021-36222.patch deleted file mode 100644 index fee6e64c15..0000000000 --- a/meta-oe/recipes-connectivity/krb5/krb5/CVE-2021-36222.patch +++ /dev/null @@ -1,121 +0,0 @@ -From fc98f520caefff2e5ee9a0026fdf5109944b3562 Mon Sep 17 00:00:00 2001 -From: Joseph Sutton <josephsutton@catalyst.net.nz> -Date: Wed, 7 Jul 2021 11:47:44 +1200 -Subject: [PATCH] Fix KDC null deref on bad encrypted challenge - -The function ec_verify() in src/kdc/kdc_preauth_ec.c contains a check -to avoid further processing if the armor key is NULL. However, this -check is bypassed by a call to k5memdup0() which overwrites retval -with 0 if the allocation succeeds. If the armor key is NULL, a call -to krb5_c_fx_cf2_simple() will then dereference it, resulting in a -crash. Add a check before the k5memdup0() call to avoid overwriting -retval. - -CVE-2021-36222: - -In MIT krb5 releases 1.16 and later, an unauthenticated attacker can -cause a null dereference in the KDC by sending a request containing a -PA-ENCRYPTED-CHALLENGE padata element without using FAST. - -[ghudson@mit.edu: trimmed patch; added test case; edited commit -message] - -ticket: 9007 (new) -tags: pullup -target_version: 1.19-next -target_version: 1.18-next - -CVE: CVE-2021-36222 - -Upstream-Status: Backport -[https://github.com/krb5/krb5/commit/fc98f520caefff2e5ee9a0026fdf5109944b3562] - -Signed-off-by: Yi Zhao <yi.zhao@windriver.com> ---- - src/kdc/kdc_preauth_ec.c | 3 ++- - src/tests/Makefile.in | 1 + - src/tests/t_cve-2021-36222.py | 46 +++++++++++++++++++++++++++++++++++ - 3 files changed, 49 insertions(+), 1 deletion(-) - create mode 100644 src/tests/t_cve-2021-36222.py - -diff --git a/src/kdc/kdc_preauth_ec.c b/src/kdc/kdc_preauth_ec.c -index 7e636b3f9..43a9902cc 100644 ---- a/src/kdc/kdc_preauth_ec.c -+++ b/src/kdc/kdc_preauth_ec.c -@@ -87,7 +87,8 @@ ec_verify(krb5_context context, krb5_data *req_pkt, krb5_kdc_req *request, - } - - /* Check for a configured FAST ec auth indicator. */ -- realmstr = k5memdup0(realm.data, realm.length, &retval); -+ if (retval == 0) -+ realmstr = k5memdup0(realm.data, realm.length, &retval); - if (realmstr != NULL) - retval = profile_get_string(context->profile, KRB5_CONF_REALMS, - realmstr, -diff --git a/src/tests/Makefile.in b/src/tests/Makefile.in -index fc6fcc0c3..1a1938306 100644 ---- a/src/tests/Makefile.in -+++ b/src/tests/Makefile.in -@@ -166,6 +166,7 @@ check-pytests: unlockiter s4u2self - $(RUNPYTEST) $(srcdir)/t_cve-2012-1015.py $(PYTESTFLAGS) - $(RUNPYTEST) $(srcdir)/t_cve-2013-1416.py $(PYTESTFLAGS) - $(RUNPYTEST) $(srcdir)/t_cve-2013-1417.py $(PYTESTFLAGS) -+ $(RUNPYTEST) $(srcdir)/t_cve-2021-36222.py $(PYTESTFLAGS) - $(RM) au.log - $(RUNPYTEST) $(srcdir)/t_audit.py $(PYTESTFLAGS) - $(RUNPYTEST) $(srcdir)/jsonwalker.py -d $(srcdir)/au_dict.json \ -diff --git a/src/tests/t_cve-2021-36222.py b/src/tests/t_cve-2021-36222.py -new file mode 100644 -index 000000000..57e04993b ---- /dev/null -+++ b/src/tests/t_cve-2021-36222.py -@@ -0,0 +1,46 @@ -+import socket -+from k5test import * -+ -+realm = K5Realm() -+ -+# CVE-2021-36222 KDC null dereference on encrypted challenge preauth -+# without FAST -+ -+s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) -+a = (hostname, realm.portbase) -+ -+m = ('6A81A0' '30819D' # [APPLICATION 10] SEQUENCE -+ 'A103' '0201' '05' # [1] pvno = 5 -+ 'A203' '0201' '0A' # [2] msg-type = 10 -+ 'A30E' '300C' # [3] padata = SEQUENCE OF -+ '300A' # SEQUENCE -+ 'A104' '0202' '008A' # [1] padata-type = PA-ENCRYPTED-CHALLENGE -+ 'A202' '0400' # [2] padata-value = "" -+ 'A48180' '307E' # [4] req-body = SEQUENCE -+ 'A007' '0305' '0000000000' # [0] kdc-options = 0 -+ 'A120' '301E' # [1] cname = SEQUENCE -+ 'A003' '0201' '01' # [0] name-type = NT-PRINCIPAL -+ 'A117' '3015' # [1] name-string = SEQUENCE-OF -+ '1B06' '6B7262746774' # krbtgt -+ '1B0B' '4B5242544553542E434F4D' -+ # KRBTEST.COM -+ 'A20D' '1B0B' '4B5242544553542E434F4D' -+ # [2] realm = KRBTEST.COM -+ 'A320' '301E' # [3] sname = SEQUENCE -+ 'A003' '0201' '01' # [0] name-type = NT-PRINCIPAL -+ 'A117' '3015' # [1] name-string = SEQUENCE-OF -+ '1B06' '6B7262746774' # krbtgt -+ '1B0B' '4B5242544553542E434F4D' -+ # KRBTEST.COM -+ 'A511' '180F' '31393934303631303036303331375A' -+ # [5] till = 19940610060317Z -+ 'A703' '0201' '00' # [7] nonce = 0 -+ 'A808' '3006' # [8] etype = SEQUENCE OF -+ '020112' '020111') # aes256-cts aes128-cts -+ -+s.sendto(bytes.fromhex(m), a) -+ -+# Make sure kinit still works. -+realm.kinit(realm.user_princ, password('user')) -+ -+success('CVE-2021-36222 regression test') --- -2.25.1 - |