PT-2012-1006 · Cisco · Cisco Ios+1
Published
2012-03-28
·
Updated
2017-12-13
·
CVE-2012-0386
CVSS v2.0
7.8
High
| Vector | AV:N/AC:L/Au:N/C:N/I:N/A:C |
Name of the Vulnerable Software and Affected Versions
Cisco IOS versions 12.2, 12.4, 15.0, 15.1, and 15.2
Cisco IOS XE versions 2.3.x through 2.6.x and 3.1.xS through 3.4.xS before 3.4.2S
Description
The Secure Shell (SSH) server implementation in Cisco IOS Software and Cisco IOS XE Software contains a denial of service (DoS) vulnerability in the SSH version 2 (SSHv2) feature. An unauthenticated, remote attacker could exploit this vulnerability by attempting a reverse SSH login with a crafted
username. Successful exploitation of this vulnerability could allow an attacker to create a DoS condition by causing the device to reload. Repeated exploits could create a sustained DoS condition.Recommendations
For Cisco IOS versions 12.2, 12.4, 15.0, 15.1, and 15.2, update to a version that includes the fix for this vulnerability.
For Cisco IOS XE versions 2.3.x through 2.6.x and 3.1.xS through 3.4.xS, update to version 3.4.2S or later.
As a temporary workaround, consider disabling the SSHv2 service until a patch is available.
Restrict access to the SSH server to minimize the risk of exploitation.
Avoid using crafted usernames in reverse SSH login attempts until the issue is resolved.
Fix
DoS
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Weakness Enumeration
Related Identifiers
Affected Products
Cisco Ios
Cisco Ios Xe