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Backdoor in ScreenOS (Telnet)
Information
Severity
Severity
Critical
Family
Family
Default Accounts
CVSSv2 Base
CVSSv2 Base
10.0
CVSSv2 Vector
CVSSv2 Vector
AV:N/AC:L/Au:N/C:C/I:C/A:C
Solution Type
Solution Type
Vendor Patch
Created
Created
8 years ago
Modified
Modified
5 years ago
Summary
ScreenOS is vulnerable to an unauthorized remote administrative access to the device over SSH or telnet.
Insight
Insight
It was possible to login using any username and the password: <<< %s(un='%s') = %u In February 2018 it was discovered that this vulnerability is being exploited by the 'DoubleDoor' Internet of Things (IoT) Botnet.
Affected Software
Affected Software
These issues can affect any product or platform running ScreenOS 6.2.0r15 through 6.2.0r18 and 6.3.0r12 through 6.3.0r20.
Detection Method
Detection Method
Try to login with backdoor credentials
Solution
Solution
This issue was fixed in ScreenOS 6.2.0r19, 6.3.0r21, and all subsequent releases.