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Home  Ask the Team  Mailing Lists  Advertising Info  Advisories  About SecuriTeam  Blogs Brought to you by: Suppliers of: Website Testing Tools Network Testing Tools Software Testing Tools SecuriTeam in Your Inbox New vulnerability? New tool? Tell us (Our PGP key). Confidence 2013 5% Off any SANS course Use Code: SecuriTeam_5 Hack In Paris La Nuit du Hack Subjects of Interest: Vulnerability Management SQL Injection Buffer Overflows Active Network Scanning Fuzzing Fuzzer Report Network Security Network Scanner Pen Testing Security Scanner	Cisco IPSec VPN Implementation Group Name Enumeration Vulnerability 8 Jul. 2011    Summary Cisco IPSec VPN Implementation suffers from a Group Name Enumeration Vulnerability.   Credit: The information has been provided by Gavin Jones. The original article can be found at: http://seclists.org/bugtraq/2011/Mar/204 Free Website Security Scan Free Fuzzer Report Vulnerability Assessment Detect web app vulnerabilities University study comparing the top Accurate and automated scanning Get guidance from professionals. 6 commercially availble fuzzers. for networks of any size.    Details Protect your website! Free Trial, Nothing to install. No interruption of visitors. www.beyondsecurity.com/vulnerability-scanner Vulnerable Systems:  * Cisco ASA 5500 Series Adaptive Security Appliances  * Cisco PIX 500 Series Security Appliances  * Cisco VPN 3000 Series Concentrators model 3005  * Cisco VPN 3000 Series Concentrators model 3015  * Cisco VPN 3000 Series Concentrators model 3020  * Cisco VPN 3000 Series Concentrators model 3030  * Cisco VPN 3000 Series Concentrators model 3060  * Cisco VPN 3000 Series Concentrators model 3080 Due to the device(s) returning differing responses to IKE requests it is possible to enumerate valid group names from the VPN device(s). With the correct group name the pre-shared key can then be captured and a brute-force attack carried out off-line. This output shows an aggressive query against the device specifying an invalid group: Starting ike-scan 1.9 with 1 hosts (http://www.nta-monitor.com/tools/ike-scan/) 10.1.0.1 Aggressive Mode Handshake returned HDR=(CKY-R=d508a1efacad8015) SA=(Enc=3DES Hash=SHA1 Group=2:modp1024 Auth=XAUTH LifeType=Seconds LifeDuration=28800) KeyExchange(128 bytes) Nonce(20 bytes) ID(Type=ID_FQDN, Value=Pix.domain.com) Hash(20 bytes) VID=12f5f28c457168a9702d9fe274cc0100 (Cisco Unity) VID=09002689dfd6b712 (XAUTH) VID=4048b7d56ebce88525e7de7f00d6c2d3c0000000 (IKE Fragmentation) VID=1f07f70eaa6514d3b0fa96542a500100 (Cisco VPN Concentrator) Ending ike-scan 1.9: 1 hosts scanned in 0.031 seconds (32.62 hosts/sec). 1 returned handshake; 0 returned notify The above request is then repeated with a valid group name and as can be seen the response is different: Starting ike-scan 1.9 with 1 hosts (http://www.nta-monitor.com/tools/ike-scan/) 10.1.0.1 Aggressive Mode Handshake returned HDR=(CKY-R=4fa4cf45d5039335) SA=(Enc=3DES Hash=SHA1 Group=2:modp1024 Auth=XAUTH LifeType=Seconds LifeDuration=28800) KeyExchange(128 bytes) Nonce(20 bytes) ID(Type=ID_FQDN, Value=Pix.domain.com) Hash(20 bytes) VID=12f5f28c457168a9702d9fe274cc0100 (Cisco Unity) VID=09002689dfd6b712 (XAUTH) VID=afcad71368a1f1c96b8696fc77570100 (Dead Peer Detection v1.0) VID=4048b7d56ebce88525e7de7f00d6c2d3c0000000 (IKE Fragmentation) VID=1f07f70eaa6514d3b0fa96542a500100 (Cisco VPN Concentrator) Ending ike-scan 1.9: 1 hosts scanned in 0.031 seconds (32.19 hosts/sec). 1 returned handshake; 0 returned notify As can be seen above, the request with the valid group name has an additional field contained in the response: VID=afcad71368a1f1c96b8696fc77570100 (Dead Peer Detection v1.0) By checking the responses for this additional VID it is possible to enumerate the valid group name. This has been replicated in testing against a number of PIX based devices and with the valid group name the PSK can then be collected and cracked using psk-crack. Patch Availability: Cisco has released a patch that addresses the issue. The announcement of this patch can be found here: http://www.cisco.com/en/US/products/products_security_response09186a0080b5992c.html Patches can be downloaded from Cisco's online support portal at: http://www.cisco.com Disclosure Timeline: Discovered: 20 March 2009 Released: 8 November 2010 Approved: 8 November 2010 Reported: 8 November 2010 Fixed: 1 December 2010 Published: 22 March 2011  Comments: blog comments powered by Disqus	All Sections Security News Unix focus Exploits Tools Windows focus Security Reviews  Related Articles Moodle WebDav Repository Plaintext Password Disclosure Vulnerability QuickShare File Share Directory Traversal Vulnerability ELinks Security Bypass Vulnerability BlazeDVD PLF Exploit DEP/ASLR Bypass (MSF) Vulnerability WebKit Web Audio Channel Handling Race Condition Buffer Overflow Vulnerability Verax NMS Console AMF Response Plaintext Connection Information Disclosure Vulnerability Simeji for Android Application Handling Information Disclosure Vulnerability Ptlib Entity Expansion Recursion XML Nested Entity Handling DoS Vulnerability ownCloud /core/settings/ajax/setquota.php quota Parameter XSS Vulnerability Nitro Pro PDF File Handling DoS Vulnerability MailOrderWorks Dispatch Order Multiple Field XSS Vulnerability Linux Kernel Dccp Subsystem Ccid Null Pointer Dereference Local DoS Vulnerability ISC DHCP libdns Unspecified Remote Memory Exhaustion DoS Vulnerability GroundWork Monitor Enterprise Noma Component Multiple XSS Vulnerability GroundWork Monitor Enterprise Foundation Admin Interface XSS Vulnerability Google Chrome Isolated Web Sites Process Handling Issue Vulnerability Google Android On Samsung Unprivileged Arbitrary SMS Message Sending Vulnerability FFmpeg Libavcodec/error Function NULL Pointer Dereference DoS Vulnerability Commons Groups Module for Drupal Group Access Restriction Bypass Vulnerability Cfingerd RFC1413 (Ident) Client Remote Overflow Vulnerability  Featured Articles Mozilla Multiple Product HTML Editor Function Use-after-free Arbitrary Code Execution Vulnerability Exim with Dovecot Typical Misconfiguration Leads to Remote Command Execution Vulnerability IBM InfoSphere Information Server Unspecified Arbitrary Site Redirect Vulnerability Cisco Unity Express /Web/SA2/ScriptList.do gui_pagenotableData Parameter XSS Vulnerability Supportworks ITSM SQL Injection Vulnerability WirelessFiles for iPad/iPhone Multiple File Extension Upload Arbitrary Script Code Execution Vulnerability IBM InfoSphere Information Server Import Export Manager Path Subversion Arbitrary DLL Injection Code Execution Vulnerability CommentLuv Plugin for WordPress /wp-admin/admin-ajax.php _ajax_nonce Parameter XSS Vulnerability ownCloud Multiple Script Multiple Administrator Action CSRF Vulnerability IBM Multiple Product XSS Vulnerability TLS / DTLS Protocol CBC-Mode Ciphersuite Distinguishing Attack Information Disclosure Weakness Vulnerability JBoss Enterprise Application Platform / JBoss Enterprise Web Platform JMX Invoker Roll Restriction Weakness Vulnerability Google AD Sync Tool Exposure Of Sensitive Information Vulnerability VMware Multiple Product vmci.sys VMCI Control Code Handling Local Privilege Escalation Vulnerability Cisco Unity Express /Web/SA/SaveConfiguration.do Multiple Action CSRF Vulnerability AdPeeps /adpeeps_servlet.php Bannertext Parameter XSS Vulnerability Oracle Application Framework Diagnostic Mode Bypass Vulnerability Nero MediaHome NMMediaServer.dll Long Request Line Off-By-One Overflow Vulnerability Samba Samba Web Administration Tool (SWAT) Manipulation CSRF Vulnerability Adobe Flash Player And AIR Context Dependent Attacker Buffer Overflow Vulnerability
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