Signature Detail
Short Name |
DOS:NETDEV:CATALYST-SSH-DOS |
|---|---|
Severity |
High |
Recommended |
No |
Recommended Action |
Drop |
Category |
DOS |
Keywords |
Cisco Catalyst SSH Protocol Mismatch DoS |
Release Date |
2003/04/22 |
Update Number |
1213 |
Supported Platforms |
idp-4.0+, isg-3.0+, j-series-9.5+, mx-9.4+, srx-9.2+, srx-branch-9.4+, vsrx-12.1+ |
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 6.1.0 (1)
- Cisco Catalyst 4000 6.1.0 (1A)
- Cisco Catalyst 4000 6.1.0 (1B)
- Cisco Catalyst 4000
- Cisco Catalyst 5000 6.1.0 (1)
- Cisco Catalyst 5000 6.1.0 (1A)
- Cisco Catalyst 5000 6.1.0 (1B)
- Cisco Catalyst 5000
- Cisco Catalyst 6000 6.1.0 (1)
- Cisco Catalyst 6000 6.1.0 (1A)
- Cisco Catalyst 6000 6.1.0 (1B)
- Cisco Catalyst 6000
References