ChironFS file ownership insecure permissions

chironfs-file-insecure-permissions (36751)

Medium Risk

Description:

ChironFS could allow a local attacker to gain elevated privileges on the vulnerable system, caused by insecure permissions set on the file ownership of files created on a ChironFS system and mounted by another user. By creating specially-crafted files, a local attacker could exploit this vulnerability to execute arbitrary code on the vulnerable system with root privileges.

*CVSS:

Base Score:	7.2
Access Vector:	Local
Access Complexity:	Low
Authentication:	None
Confidentiality Impact:	Complete
Integrity Impact:	Complete
Availability Impact:	Complete
Temporal Score:	5.3
Exploitability:	Unproven
Remediation Level:	Official-Fix
Report Confidence:	Confirmed

Consequences:

Gain Privileges

Remedy:

Upgrade to the latest version of ChironFS (1.0 RC7 or later), available from the ChironFS Web site. See References.

References:

• ChironFS Web page: Changelog - Release Notes for ChironFS 1.0RC7.
• Google Code Web site: Reported by ndbecker2, Sep 12, 2007: Chiron FS - A FUSE based replication filesystem: security!!!.
• BID-25780: ChironFS File Creation Local Privilege Escalation Vulnerability
• CVE-2007-5101: ChironFS before 1.0 RC7 sets user/group ownership to the mounter account instead of the creator account when files are created, which allows local users to gain privileges.
• SA26943: ChironFS File Creation Incorrect Ownership Vulnerability

Platforms Affected:

• ChironFS ChironFS prior to 1.0 RC7

Reported:

Sep 21, 2007

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