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.
Classification
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
Solution
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.
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