ID

VAR-200705-0481

CVE

CVE-2007-2464

TITLE

Cisco ASA clientless SSL VPN denial of service vulnerability

DESCRIPTION

Race condition in Cisco Adaptive Security Appliance (ASA) and PIX 7.1 before 7.1(2)49 and 7.2 before 7.2(2)19, when using "clientless SSL VPNs," allows remote attackers to cause a denial of service (device reload) via "non-standard SSL sessions.". The Cisco ASA and PIX firewalls contain an authentication bypass vulnerability. This vulnerability may allow a remote attacker to gain unauthorized access to the internal network or firewall. The Cisco Adaptive Security Appliance contains a memory exhaustion vulnerability that may occur when the DHCP service relay is enabled. Remote attackers may use this vulnerability to cause the device to fail to work normally or to bypass authentication. This vulnerability is documented as bug CSCsi16248. ---------------------------------------------------------------------- Try a new way to discover vulnerabilities that ALREADY EXIST in your IT infrastructure. Join the FREE BETA test of the Network Software Inspector (NSI)! http://secunia.com/network_software_inspector/ The NSI enables you to INSPECT, DISCOVER, and DOCUMENT vulnerabilities in more than 4,000 different Windows applications. 1) An unspecified error exists when using the LDAP authentication mechanism, which can be exploited to bypass the authentication and gain access to the device or the network. Successful exploitation requires that the device uses the Layer 2 Tunneling Protocol (L2TP) and is configured to use LDAP servers with another protocol other than PAP for authentication, or that the device offers remote management access (telnet, SSH, HTTP) and uses an LDAP AAA server for authentication. 2) An unspecified error when using VPN connections configured with password expiry can be exploited to cause a DoS. Successful exploitation requires that the tunnel group is configured with password expiry. In order to exploit this in IPSec VPN connections, an attacker also needs to know the group name and group password. Successful exploitation requires that clientless SSL is used. 4) An error within the DHCP relay agent when handling DHCPACK messages can be exploited to cause a DoS due to memory exhaustion by sending a large number of DHCP requests to a vulnerable device. Successful exploitation requires that devices are configured to use the DHCP relay agent. SOLUTION: Apply updated software versions. Please see vendor advisories for details. PROVIDED AND/OR DISCOVERED BY: 1-3) Reported by the vendor. 4) Lisa Sittler and Grant Deffenbaugh, CERT/CC. ORIGINAL ADVISORY: Cisco: http://www.cisco.com/warp/public/707/cisco-sa-20070502-asa.shtml http://www.cisco.com/warp/public/707/cisco-sr-20070502-pix.shtml http://www.cisco.com/en/US/products/products_security_response09186a0080833172.html http://www.cisco.com/en/US/products/products_applied_intelligence_response09186a008083316f.html US-CERT VU#530057: http://www.kb.cert.org/vuls/id/530057 OTHER REFERENCES: US-CERT VU#210876: http://www.kb.cert.org/vuls/id/210876 ---------------------------------------------------------------------- About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities. Subscribe: http://secunia.com/secunia_security_advisories/ Definitions: (Criticality, Where etc.) http://secunia.com/about_secunia_advisories/ Please Note: Secunia recommends that you verify all advisories you receive by clicking the link. Secunia NEVER sends attached files with advisories. Secunia does not advise people to install third party patches, only use those supplied by the vendor. ---------------------------------------------------------------------- Unsubscribe: Secunia Security Advisories http://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org ----------------------------------------------------------------------

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

lack of information

CONFIGURATIONS

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Cisco Security bulletin

SOURCES

LAST UPDATE DATE

2024-11-23T22:43:22.964000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE