SB2020021146 - Remote code execution in Microsoft Exchange

Description

This security bulletin contains information about 1 vulnerability.

1) Deserialization of untrusted data (CVE-ID: CVE-2020-0688)

CWE-ID: CWE-502 - Deserialization of Untrusted Data

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

The vulnerability allows a remote attacker to execute arbitrary on the system.

The vulnerability exists due to an input validation error within the Microsoft Exchange OCP interface when processing VIEWSTATE data. A remote authenticated attacker can send a specially crafted HTTP request to a vulnerable Exchange server and execute arbitrary code on the target system.

Note, this vulnerability is being actively exploited in the wild.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0688
• https://www.thezdi.com/blog/2020/2/24/cve-2020-0688-remote-code-execution-on-microsoft-exchange-serv...
• https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/http/exchange_ec...