CVE-2010-3879

FUSE, possibly 2.8.5 and earlier, allows local users to create mtab entries with arbitrary pathnames, and consequently unmount any filesystem, via a symlink attack on the parent directory of the mountpoint of a FUSE filesystem, a different vulnerability than CVE-2010-0789.

Weakness

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

Affected Software

Potential Mitigations

• Follow the principle of least privilege when assigning access rights to entities in a software system.
• Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/132.html
• https://cwe.mitre.org/data/definitions/17.html
• https://cwe.mitre.org/data/definitions/35.html
• https://cwe.mitre.org/data/definitions/76.html

References

• http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=602333
• http://lists.fedoraproject.org/pipermail/package-announce/2011-February/053792.html
• http://lists.grok.org.uk/pipermail/full-disclosure/2010-November/077247.html
• http://lists.opensuse.org/opensuse-security-announce/2011-04/msg00000.html
• http://openwall.com/lists/oss-security/2010/11/04/8
• http://openwall.com/lists/oss-security/2010/11/05/2
• http://osvdb.org/70520
• http://secunia.com/advisories/42961
• http://secunia.com/advisories/42965
• http://www.halfdog.net/Security/FuseTimerace/
• http://www.mandriva.com/security/advisories?name=MDVSA-2013:155
• http://www.securityfocus.com/bid/44623
• http://www.ubuntu.com/usn/USN-1045-1
• http://www.ubuntu.com/usn/USN-1045-2
• http://www.vupen.com/english/advisories/2011/0181
• http://www.vupen.com/english/advisories/2011/0302
• https://bugs.launchpad.net/bugs/670622
• https://bugzilla.novell.com/show_bug.cgi?id=651598
• https://bugzilla.redhat.com/show_bug.cgi?id=651183
• https://exchange.xforce.ibmcloud.com/vulnerabilities/62986