DOS: Cisco Catalyst SSH Protocol Mismatch DoS
This signature detects attempts to exploit a known vulnerability against a Cisco Catalyst switch. When negotiating an SSH connection with a Cisco Catalyst switch, attackers can use the thong.pl exploit to send an invalid SSH header reply, hanging the service and creating a denial-of-service (DoS) condition.
Extended Description
Software versions 6.1(1), 6.1(1a) and 6.1(1b) for Catalyst 4000, 5000, and 6000 devices that support SSH and 3 DES encryption contain a vulnerability that may allow an attacker to cause a denial of service. If a connection is made to the SSH service on a vulnerable Catalyst device and the protocol mismatch error occurs, the device will be reset.
Affected Products
Cisco catalyst_4000
Short Name
DOS:NETDEV:CATALYST-SSH-DOS
Severity
Major
Recommended
False
Recommended Action
Drop
Category
DOS
Keywords
CVE-2001-0080 CVE-2007-6166 Catalyst Cisco DoS Mismatch Protocol SSH bid:2117
Release Date
04/22/2003
Supported Platforms
srx-branch-12.3
srx-19.3
srx-branch-19.3
vsrx3bsd-19.2
srx-branch-19.4
vsrx-19.4
mx-12.3
mx-19.4
vmx-19.4
mx-19.3
vsrx3bsd-19.4
srx-19.4
vsrx-12.3
vmx-19.3
vsrx-19.2
srx-12.3
Sigpack Version
3336
False Positive
Unknown
Vendors
Cisco
CVSS Score
9.3
5.0