The Linux kernel 220.127.116.11 and earlier, when a ReiserFS filesystem exists, does not restrict read or write access to the .reiserfs_priv directory, which allows local users to gain privileges by modifying (1) extended attributes or (2) ACLs, as demonstrated by deleting a file under .reiserfs_priv/xattrs/.
CVSS Severity (version 2.0):
Impact Subscore: 10.0
Exploitability Subscore: 3.4
CVSS Version 2 Metrics:
Access Vector: Locally exploitable
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 (04/12/2010)
Not vulnerable. The Linux kernel as shipped with with Red Hat Enterprise Linux 3, 4, 5 and Red Hat Enterprise MRG did not include support for reiserfs and therefore are not affected by this issue.
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[linux-kernel] 20100408 [PATCH #3] reiserfs: Fix permissions on .reiserfs_priv