SB2007101002 - Remote code execution via URI handlers in Microsoft Windows

Description

This security bulletin contains information about 1 vulnerability.

1) OS command injection (CVE-ID: CVE-2007-3896)

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red

The vulnerability allows a remote user to execute arbitrary code on the target system.

The vulnerability exists due to insufficient filtration of URIs in Shell32.dll when open applications via URL handlers (e.g. mailto:). A remote attacker can create a specially crafted URI, containing invalid sequence of % characters, trick the victim to click on it and execute arbitrary system commands with privileges of the current user.

Successful exploitation of the vulnerability results in compromise of vulnerable system.

Note: this vulnerability is being actively exploited.

Remediation

Install update from vendor's website.

References

• https://technet.microsoft.com/library/security/943521
• https://technet.microsoft.com/en-us/library/security/ms07-061.aspx