UNIX news readers tin and rtin create the /tmp/.tin_log file with insecure permissions and follow symlinks, which allows attackers to modify the permissions of files writable by the user via a symlink attack.
CVSS Severity (version 2.0):
Impact Subscore: 2.9
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows unauthorized modification
References to Advisories, Solutions, and Tools
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19960903 Re: BoS: [BUG] Vulnerability in TIN
Advisory; Patch Information
19960903 [BUG] Vulnerability in TIN
19970329 symlink bug in tin/rtin
Vulnerable software and versions