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TITLE:
Cisco PIX and ASA Denial of Service and Security Bypass

SECUNIA ADVISORY ID:
SA25109

VERIFY ADVISORY:
http://secunia.com/advisories/25109/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass, DoS

WHERE:
>From remote

OPERATING SYSTEM:
Cisco Adaptive Security Appliance (ASA) 7.x
http://secunia.com/product/6115/
Cisco PIX 7.x
http://secunia.com/product/6102/

DESCRIPTION:
Some vulnerabilities have been reported in Cisco PIX and ASA, which
can be exploited by malicious people to bypass certain security
restrictions or cause a DoS (Denial of Service).

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.

3) A race condition within the processing of non-standard SSL
sessions in the SSL VPN server of Cisco ASA appliances can be
exploited to cause the device to reload.

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

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About:
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