Race condition in GNU screen 4.0.3 allows local users to create or overwrite arbitrary files via a symlink attack on the /tmp/screen-exchange temporary file.
CVSS Severity (version 2.0):
Impact Subscore: 2.9
Exploitability Subscore: 3.4
CVSS Version 2 Metrics:
Access Vector: Locally exploitable
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: Allows unauthorized modification
Official Statement from Red Hat (04/02/2009)
Red Hat does not consider this to be a security issue. The checks implemented by screen to protect against race condition attacks on /tmp/screen-exchange file provide sufficient protection for this rarely-used buffer exchange feature. For more details, see https://bugzilla.redhat.com/show_bug.cgi?id=492104
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[oss-security] 20090325 CVE request -- zsh, XFree86-xfs/xorg-x11-xfs, screen
Vulnerable software and versions