Advisory Details

February 12th, 2018

Joyent SmartOS SMB_IOC_SVCENUM Heap-based Buffer Overflow Privilege Escalation Vulnerability

ZDI-18-158
ZDI-CAN-4983

CVE ID CVE-2018-1165
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 SMB_IOC_SVCENUM IOCTL. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length, heap-based buffer. 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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