SB2019091027 - Privilege escalation in Windows AppX Deployment Server

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Buffer overflow (CVE-ID: CVE-2019-1253)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error when the Windows AppX Deployment Server improperly handles junctions. A local user can use a specially crafted application to trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

2) Buffer overflow (CVE-ID: CVE-2019-1303)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error when the Windows AppX Deployment Server improperly handles junctions. A local user can use a specially crafted application to trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1253
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1303