39587 : GNU Screen Locked Screen Password Bypass
Printer | http://osvdb.org/39587 | Email This | Edit Vulnerability

Views This Week Views All Time Added to OSVDB Last Modified Modified (since 2008) Percent Complete
4 2703 over 6 years ago about 5 years ago 16 times 90%


Disclosure Date


GNU Screen contains a flaw that may allow a malicious user to gain access to a locked screen session. The issue is triggered when a screen session is locked using "ctrl-a x:", and an attacker types CTRL-C at the password prompt to abort the lock mechanism. Typing "screen -r" to restore the detached screen will grant access without prompting for the password.


Location: Physical Access Required
Attack Type: Authentication Management, Input Manipulation
Impact: Loss of Integrity
Solution: Third-Party Solution
Exploit: Exploit Public
Disclosure: Vendor Verified, Third-party Disputed, Uncoordinated Disclosure


Currently, there are no known workarounds or upgrades to correct this issue. However, Tobias Ulmer, OpenBSD contributor, has released an unofficial patch to address this vulnerability.





  • Rembrandt - rembrandthelith.net - Helith

CVSSv2 Score

CVSSv2 Base Score = 7.2
Source: nvd.nist.gov | Generated: 2007-06-06 | Disagree?

Access_vector_0 Access_complexity_2 Authentication_2 Confidentiality_impact_2 Integrity_impact_2 Availability_impact_2


No Comments.

The database information may change without any notice. Use of the information constitutes acceptance for use in an AS IS condition, and there are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the copyright holder or distributor (OSVDB or OSF) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

© Copyright 2002 - 2014 Open Sourced Vulnerability Database (OSVDB), All Rights Reserved.
Privacy Statement - Terms of Use