CVE-2018-6855 - Permissions, Privileges, and Access Control vulnerability in Sophos products

Publication

2018-07-09

Last modification

2018-09-07

Summary

Sophos SafeGuard Enterprise before 8.00.5, SafeGuard Easy before 7.00.3, and SafeGuard LAN Crypt before 3.95.2 are vulnerable to Local Privilege Escalation via IOCTL 0x80202014. By crafting an input buffer we can control the execution path to the point where the constant 0xFFFFFFF will be written to a user-controlled address. We can take advantage of this condition to modify the SEP_TOKEN_PRIVILEGES structure of the Token object belonging to the exploit process and grant SE_DEBUG_NAME privilege. This allows the exploit process to interact with higher privileged processes running as SYSTEM and execute code in their security context.

Classification

CWE-264 - Permissions, Privileges, and Access Control

Risk level (CVSS AV:L/AC:L/Au:N/C:C/I:C/A:C)

High

7.2

Access Vector

  • Network
  • Adjacent Network
  • Local

Access Complexity

  • Low
  • Medium
  • High

Authentication

  • None
  • Single
  • Multiple

Confident. Impact

  • Complete
  • Partial
  • None

Integrity Impact

  • Complete
  • Partial
  • None