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July 8, 2022Severity
High
Analysis Summary
A zero-day vulnerability in Microsoft Office is being actively exploited in the wild, and while there isn’t currently a patch, the software giant has published workarounds to thwart attacks. CVE-2022-30190, also known as “Follina,” is a remote code execution (RCE) vulnerability affecting the Microsoft Support Diagnostic Tool (MSDT) in Windows.
CVE-2022-30190
Microsoft Windows could allow a remote attacker to execute arbitrary code on the system, caused by a flaw in the Support Diagnostic Tool (MSDT) component. By persuading a victim to open specially-crafted content, an attacker could exploit this vulnerability to execute arbitrary code on the system. Microsoft Support Diagnostics Tool (MSDT) is used by support professionals for troubleshooting.
According to the researcher, maldoc retrieves an HTML file from a server using Word’s template feature. The malicious payload is then obtained via the “ms-msdt: //” URI scheme.
The attackers who successfully exploit this vulnerability can run arbitrary code with the privileges of the calling application. The attacker can then install programs, view, change, delete data, or create new accounts in the context allowed by the user’s permissions.
Here are the workaround guidance shared by Microsoft:
Impact
- Code Execution
- Privilege Escalation
Indicators Of Compromise
MD5
- 98c9dd331910cdf41792f02bb11c822d
- eff1db20208125882d710936a99ab3b0
SHA-256
- 590b8232022d73d93d73172abd71cb9a79cd2bc3cbba454d88120fd39ca8b3a7
- 542f99d44146474e143a6fd94453a98a542dd48837d93c197e7e01a3fba6603d
SHA-1
- c2385f88243e9d41a615a341738c027c727633e8
- fe7d75b6425473a6b27425ca45f6c0e99eeae3da
URL
- http[:]//z3[.]medicarepartus[.]com/1
- http[:]//schemas[.]medicareplanupgrade[.]xyz/tr[.]txt
Remediation
- Block all threat indicators at your respective controls.
- Search for Indicator of compromise (IOCs) in your environment utilizing your respective security controls
- Use Microsoft Automatic Update to apply the appropriate patch for your system, or the Microsoft Security Update Guide
- to search for available patches.
- Customers using Microsoft Defender Antivirus should turn-on cloud-delivered protection and automatic sample
- submission.
- Customers that use Microsoft Defender for Endpoint can set the “BlockOfficeCreateProcessRule” attack surface
- reduction rule, which prevents Office apps from generating child processes.