|Bugzilla:||921448: CVE-2013-1858 kernel: CLONE_NEWUSER | CLONE_FS chroot exploit|
The MITRE CVE dictionary describes this issue as:
The clone system-call implementation in the Linux kernel before 3.8.3 does not properly handle a combination of the CLONE_NEWUSER and CLONE_FS flags, which allows local users to gain privileges by calling chroot and leveraging the sharing of the / directory between a parent process and a child process.
This issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5, 6, and Red Hat Enterprise MRG 2.
This issue did not affect the versions of the Linux kernel as shipped with Fedora 17 and 18 as they were not built with CONFIG_USER_NS configuration option.
CVSS v2 metrics
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Red Hat security errata
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