39587 : GNU Screen Locked Screen Password Bypass
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Timeline

Disclosure Date
2007-06-03

Description

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.

Products

GNU
Screen
4.0.3

References

Credit

  • 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

Comments

No Comments.

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