SB2018021903 - Security restrictions bypass in Microsoft Edge
Published: February 19, 2018 Updated: June 11, 2019
Security Bulletin ID
SB2018021903
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Security restrictions bypass (CVE-ID: N/A)
The vulnerability allows a remote attacker to bypass security restrictions on the target system.The weakness exists in Arbitrary Code Guard (ACG) technology for Windows 10 Creators Update due to an error when data is writtent in the process of content during Just-in-time compilation. A remote attacker can compromise the content process that allows to predict on which address JIT process is going to call VirtualAllocEx() next, unmap the shared memory mapped above using UnmapViewOfFile(), allocate a writable memory region on the same address JIT server is going to write and write a soon-to-be-executable payload there and cause the memory protection to be set to PAGE_EXECUTE_READ when JIT process calls VirtualAllocEx().
Remediation
Install update from vendor's website.