Advisory Details

March 30th, 2017

(Pwn2Own) Linux Kernel XFRM Out-Of-Bounds Access Privilege Escalation Vulnerability

ZDI-17-240
ZDI-CAN-4586

CVE ID CVE-2017-7184
CVSS SCORE 6.9, (AV:L/AC:M/Au:N/C:C/I:C/A:C)
AFFECTED VENDORS Linux
AFFECTED PRODUCTS Linux Kernel
VULNERABILITY DETAILS


This vulnerability allows local attackers to execute arbitrary code on vulnerable installations of the Linux Kernel. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the handling of xfrm states. The issue results from the lack of proper validation of user-supplied data, which can result in a memory access past the end of an allocated buffer. An attacker can leverage this vulnerability to elevate privileges and execute arbitrary code under the context of the kernel.

ADDITIONAL DETAILS Linux has issued an update to correct this vulnerability. More details can be found at:
https://www.ubuntu.com/usn/usn-3251-1/
DISCLOSURE TIMELINE
  • 2017-03-18 - Vulnerability reported to vendor
  • 2017-03-30 - Coordinated public release of advisory
CREDIT Chaitin Security Research Lab
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