Advisory Details

February 12th, 2018

Joyent SmartOS SMBIOC_TREE_RELE Use-After-Free Privilege Escalation Vulnerability

ZDI-18-159
ZDI-CAN-4984

CVE ID CVE-2018-1166
CVSS SCORE 6.9, (AV:L/AC:M/Au:N/C:C/I:C/A:C)
AFFECTED VENDORS Joyent
AFFECTED PRODUCTS SmartOS
VULNERABILITY DETAILS


This vulnerability allows local attackers to escalate privileges on vulnerable installations of Joyent SmartOS. 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 SMBIOC_TREE_RELE ioctl. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code under the context of the host OS.

ADDITIONAL DETAILS Joyent has issued an update to correct this vulnerability. More details can be found at:
https://help.joyent.com/hc/en-us/articles/360000124928
DISCLOSURE TIMELINE
  • 2017-08-16 - Vulnerability reported to vendor
  • 2018-02-12 - Coordinated public release of advisory
  • 2018-02-12 - Advisory Updated
CREDIT Ben Murphy
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