SB2018122102 - Privilege escalation in Microsoft Windows

Description

This security bulletin contains information about 1 security vulnerability.

1) Information disclosure (CVE-ID: CVE-2019-0636)

The vulnerability allows a local attacker to read contents of arbitrary file on the target system.

The vulnerability exists due to the MsiAdvertiseProduct function enables the Windows installer to copy any file on the system and make it readable. A local unprivileged user can abuse Windows Installer functionality to make a copy of arbitrary file on local system and read its contents.

Given that Windows installer is executed with SYSTEM privileges and in case shadow copes are enabled, an attacker will be able to read contents of SAM file and SYSTEM hive.

Remediation

Install update from vendor's website.

References

• https://www.filedropper.com/readfile
• https://drive.google.com/file/d/1fMuDp1Rqy4oUrM3W7r3ika03Y9-5Xtds/view
• https://uploadfiles.io/er5g3
• https://sandboxescaper.blogspot.com/2018/12/readfile-0day.html
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0636