Author: bebuild
Date: Wed Apr 8 11:54:33 2015
New Revision: 434387
URL: http://svnview.digium.com/svn/asterisk?view=rev&rev=434387
Log:
Merge changes for AST-2015-003
Modified:
tags/11.17.1/ (props changed)
tags/11.17.1/ChangeLog
tags/11.17.1/main/tcptls.c
Propchange: tags/11.17.1/
------------------------------------------------------------------------------
Binary property 'branch-1.8-merged' - no diff available.
Propchange: tags/11.17.1/
------------------------------------------------------------------------------
svn:mergeinfo = /branches/11:434338
Modified: tags/11.17.1/ChangeLog
URL:
http://svnview.digium.com/svn/asterisk/tags/11.17.1/ChangeLog?view=diff&rev=434387&r1=434386&r2=434387
==============================================================================
--- tags/11.17.1/ChangeLog (original)
+++ tags/11.17.1/ChangeLog Wed Apr 8 11:54:33 2015
@@ -1,3 +1,28 @@
+2015-04-08 Asterisk Development Team <asteriskt...@digium.com>
+
+ * Asterisk 11.17.1 Released.
+
+ * Mitigate MitM attack potential from certificate with NULL byte in CN.
+
+ When registering to a SIP server with TLS, Asterisk will accept CA
+ signed certificates with a common name that was signed for a domain
+ other than the one requested if it contains a null character in the
+ common name portion of the cert. This patch fixes that by checking
+ that the common name length matches the the length of the content we
+ actually read from the common name segment. Some certificate
+ authorities automatically sign CA requests when the requesting CN
+ isn't already taken, so an attacker could potentially register a CN
+ with something like www.google.com\x00www.secretlyevil.net and have
+ their certificate signed and Asterisk would accept that certificate
+ as though it had been for www.google.com.
+
+ ASTERISK-24847 #close
+ Reported by: Maciej Szmigiero
+ patches:
+ asterisk-null-in-cn.patch uploaded by mhej (license 6085)
+
+ AST-2015-003
+
2015-04-01 Asterisk Development Team <asteriskt...@digium.com>
* Asterisk 11.17.0 Released.
Modified: tags/11.17.1/main/tcptls.c
URL:
http://svnview.digium.com/svn/asterisk/tags/11.17.1/main/tcptls.c?view=diff&rev=434387&r1=434386&r2=434387
==============================================================================
--- tags/11.17.1/main/tcptls.c (original)
+++ tags/11.17.1/main/tcptls.c Wed Apr 8 11:54:33 2015
@@ -639,9 +639,15 @@
break;
}
str =
X509_NAME_ENTRY_get_data(X509_NAME_get_entry(name, pos));
- ASN1_STRING_to_UTF8(&str2, str);
+ ret =
ASN1_STRING_to_UTF8(&str2, str);
+ if (ret < 0) {
+ continue;
+ }
+
if (str2) {
- if
(!strcasecmp(tcptls_session->parent->hostname, (char *) str2)) {
+ if (strlen((char *)
str2) != ret) {
+
ast_log(LOG_WARNING, "Invalid certificate common name length (contains NULL
bytes?)\n");
+ } else if
(!strcasecmp(tcptls_session->parent->hostname, (char *) str2)) {
found = 1;
}
ast_debug(3, "SSL
Common Name compare s1='%s' s2='%s'\n", tcptls_session->parent->hostname, str2);
--
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