#VU7694 Race condition in Linux kernel - CVE-2017-7533

Vulnerability identifier: #VU7694

Vulnerability risk: Medium

CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Green

CVE-ID: CVE-2017-7533

CWE-ID: CWE-362

Exploitation vector: Local access

Exploit availability: The vulnerability is being exploited in the wild

Vulnerable software:
Linux kernel

Software vendor:
Linux Foundation

The vulnerability allows a local user to execute arbitrary code with escalated privileges.

The vulnerability exists due to a race condition in the fsnotify implementation in the Linux kernel through 4.12.4. A local user can create an application, which leverages simultaneous execution of the inotify_handle_event and vfs_rename functions and trigger memory corruption and denials of service attack or execute arbitrary code on the target system with root privileges.

Successful exploitation of this vulnerability may allow a local user to obtain elevated privileges on the system.

Note: this vulnerability is being active exploited in the wild for 32-bit systems in August 2017.

Install update from vendor's repository.

• http://openwall.com/lists/oss-security/2017/08/03/2
• https://bugzilla.redhat.com/show_bug.cgi?id=1468283
• https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1408967.html
• https://patchwork.kernel.org/patch/9755753/
• https://patchwork.kernel.org/patch/9755757/
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=49d31c2f389acfe8341708...