Advisory Details

February 11th, 2020

Symantec Endpoint Protection AvHostPlugin Out-Of-Bounds Write Privilege Escalation Vulnerability

ZDI-20-217
ZDI-CAN-9420

CVE ID CVE-2020-5820
CVSS SCORE 7.8, (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
AFFECTED VENDORS Symantec
AFFECTED PRODUCTS Endpoint Protection
VULNERABILITY DETAILS

This vulnerability allows local attackers to escalate privileges on affected installations of Symantec Endpoint Protection. 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 AvHostPlugin.dll. The issue results from the lack of proper validation of user-supplied data, which can result in a write before the start of an allocated buffer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.

ADDITIONAL DETAILS Symantec has issued an update to correct this vulnerability. More details can be found at:
https://support.symantec.com/us/en/article.SYMSA1505.html
DISCLOSURE TIMELINE
  • 2019-10-01 - Vulnerability reported to vendor
  • 2020-02-11 - Coordinated public release of advisory
CREDIT Z0mb1E
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