The g_file_copy function in glib 2.0 sets the permissions of a target file to the permissions of a symbolic link (777), which allows user-assisted local users to modify files of other users, as demonstrated by using Nautilus to modify the permissions of the user home directory.
CVSS Severity (version 2.0):
Impact Subscore: 6.4
Exploitability Subscore: 3.4
CVSS Version 2 Metrics:
Access Vector: Locally exploitable; Victim must voluntarily interact with attack mechanism
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service
Official Statement from Red Hat (09/23/2009)
Not vulnerable. This issue does not affect the versions of glib2 as shipped with Red Hat Enterprise Linux 3, 4, or 5.
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[oss-security] 20090908 CVE Request - glib symlink copying permission exposure
Vulnerable software and versions