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86 lines
2.9 KiB
Diff
86 lines
2.9 KiB
Diff
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Fix CVE-2017-6594:
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https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-6594
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https://security-tracker.debian.org/tracker/CVE-2017-6594
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Patch lifted from upstream source repository:
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https://github.com/heimdal/heimdal/commit/b1e699103f08d6a0ca46a122193c9da65f6cf837
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To apply the patch to Heimdal 1.5.3 release tarball, the changes to 'NEWS' and
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files in 'tests/' are removed, and hunk #4 of 'kdc/krb5tgs.c' is modified.
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From b1e699103f08d6a0ca46a122193c9da65f6cf837 Mon Sep 17 00:00:00 2001
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From: Viktor Dukhovni <viktor@twosigma.com>
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Date: Wed, 10 Aug 2016 23:31:14 +0000
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Subject: [PATCH] Fix transit path validation CVE-2017-6594
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Commit f469fc6 (2010-10-02) inadvertently caused the previous hop realm
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to not be added to the transit path of issued tickets. This may, in
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some cases, enable bypass of capath policy in Heimdal versions 1.5
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through 7.2.
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Note, this may break sites that rely on the bug. With the bug some
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incomplete [capaths] worked, that should not have. These may now break
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authentication in some cross-realm configurations.
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---
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NEWS | 14 ++++++++++++++
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kdc/krb5tgs.c | 12 ++++++++++--
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tests/kdc/check-kdc.in | 17 +++++++++++++++++
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tests/kdc/krb5.conf.in | 4 ++++
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4 files changed, 45 insertions(+), 2 deletions(-)
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diff --git a/kdc/krb5tgs.c b/kdc/krb5tgs.c
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index 6048b9c55..98503812f 100644
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--- a/kdc/krb5tgs.c
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+++ b/kdc/krb5tgs.c
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@@ -655,8 +655,12 @@ fix_transited_encoding(krb5_context context,
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"Decoding transited encoding");
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return ret;
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}
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+
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+ /*
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+ * If the realm of the presented tgt is neither the client nor the server
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+ * realm, it is a transit realm and must be added to transited set.
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+ */
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if(strcmp(client_realm, tgt_realm) && strcmp(server_realm, tgt_realm)) {
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- /* not us, so add the previous realm to transited set */
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if (num_realms + 1 > UINT_MAX/sizeof(*realms)) {
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ret = ERANGE;
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goto free_realms;
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@@ -737,6 +741,7 @@ tgs_make_reply(krb5_context context,
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const char *server_name,
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hdb_entry_ex *client,
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krb5_principal client_principal,
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+ const char *tgt_realm,
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hdb_entry_ex *krbtgt,
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krb5_enctype krbtgt_etype,
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krb5_principals spp,
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@@ -798,7 +803,7 @@ tgs_make_reply(krb5_context context,
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&tgt->transited, &et,
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krb5_principal_get_realm(context, client_principal),
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krb5_principal_get_realm(context, server->entry.principal),
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- krb5_principal_get_realm(context, krbtgt->entry.principal));
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+ tgt_realm);
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if(ret)
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goto out;
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@@ -1519,4 +1524,6 @@ tgs_build_reply(krb5_context context,
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krb5_keyblock sessionkey;
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krb5_kvno kvno;
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krb5_data rspac;
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+ const char *tgt_realm = /* Realm of TGT issuer */
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+ krb5_principal_get_realm(context, krbtgt->entry.principal);
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@@ -2324,6 +2331,7 @@ server_lookup:
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spn,
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client,
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cp,
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+ tgt_realm,
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krbtgt_out,
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tkey_sign->key.keytype,
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spp,
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--
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2.13.3
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