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Linux kernel: privilege escalation via inode_capable
Synthesis of the vulnerability
A local attacker can manipulate files on Linux, in order to escalate his privileges.
Vulnerable products: Fedora, Android OS, Linux, openSUSE, Ubuntu.
Severity of this weakness: 2/4.
Consequences of an attack: administrator access/rights, privileged access/rights.
Hacker's origin: user shell.
Creation date: 11/06/2014.
Revision date: 18/06/2014.
Références of this bulletin: CERTFR-2014-AVI-325, CERTFR-2014-AVI-373, CVE-2014-4014, FEDORA-2014-7426, FEDORA-2014-7430, openSUSE-SU-2014:0957-1, openSUSE-SU-2014:0985-1, USN-2285-1, USN-2286-1, USN-2287-1, USN-2289-1, USN-2336-1, USN-2337-1, VIGILANCE-VUL-14880.
Description of the vulnerability
An inode is used to identify a file.
However, the inode_capable() function does not perform the expected checks on the file group in a namespace.
A local attacker can therefore manipulate files on Linux, in order to escalate his privileges.
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