Vulnerability identifier: #VU67764

Vulnerability risk: Critical

CVSSv3.1: 8.4 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2022-41082

CWE-ID: CWE-502

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Microsoft Exchange Server
Server applications / Mail servers

Vendor: Microsoft

Description

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

The vulnerability exists due to insecure input validation when processing serialized data. A remote user with access to PowerShell Remoting on vulnerable Exchange systems can pass specially crafted data to the application and execute arbitrary code on the target system.

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

Mitigation
Install update from vendor's website.

Vulnerable software versions

Microsoft Exchange Server: 2019 Preview 15.02.0196.000 - 2019 CU12 Oct22SU 15.02.1118.015, 2016 Preview 15.01.0225.016 - 2016 CU23 Oct22SU 15.01.2507.013, 2013 RTM 15.00.0516.032 - 2013 CU23 Oct22SU 15.00.1497.042

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External links
http://gteltsc.vn/blog/warning-new-attack-campaign-utilized-a-new-0day-rce-vulnerability-on-microsoft-exchange-server-12715.html
http://msrc-blog.microsoft.com/2022/09/29/customer-guidance-for-reported-zero-day-vulnerabilities-in-microsoft-exchange-server/
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2022-41082
http://www.zerodayinitiative.com/advisories/ZDI-22-1442/
http://www.zerodayinitiative.com/advisories/ZDI-22-1624/
http://www.zerodayinitiative.com/advisories/ZDI-22-1654/
http://www.zerodayinitiative.com/advisories/ZDI-22-1653/
http://www.zerodayinitiative.com/advisories/ZDI-22-1652/
http://www.zerodayinitiative.com/advisories/ZDI-22-1651/
http://www.zerodayinitiative.com/advisories/ZDI-22-1650/
http://www.zerodayinitiative.com/advisories/ZDI-22-1649/
http://www.zerodayinitiative.com/advisories/ZDI-22-1648/
http://www.zerodayinitiative.com/advisories/ZDI-22-1647/
http://www.zerodayinitiative.com/advisories/ZDI-22-1646/
http://www.zerodayinitiative.com/advisories/ZDI-22-1645/
http://www.zerodayinitiative.com/advisories/ZDI-22-1644/
http://www.zerodayinitiative.com/advisories/ZDI-22-1643/
http://www.zerodayinitiative.com/advisories/ZDI-22-1642/
http://www.zerodayinitiative.com/advisories/ZDI-22-1641/
http://www.zerodayinitiative.com/advisories/ZDI-22-1640/
http://www.zerodayinitiative.com/advisories/ZDI-22-1639/
http://www.zerodayinitiative.com/advisories/ZDI-22-1638/
http://www.zerodayinitiative.com/advisories/ZDI-22-1637/
http://www.zerodayinitiative.com/advisories/ZDI-22-1636/
http://www.zerodayinitiative.com/advisories/ZDI-22-1635/
http://www.zerodayinitiative.com/advisories/ZDI-22-1634/
http://www.zerodayinitiative.com/advisories/ZDI-22-1633/
http://www.zerodayinitiative.com/advisories/ZDI-22-1632/
http://www.zerodayinitiative.com/advisories/ZDI-22-1631/
http://www.zerodayinitiative.com/advisories/ZDI-22-1630/
http://www.zerodayinitiative.com/advisories/ZDI-22-1629/
http://www.zerodayinitiative.com/advisories/ZDI-22-1628/
http://www.zerodayinitiative.com/advisories/ZDI-22-1627/
http://www.zerodayinitiative.com/advisories/ZDI-22-1626/
http://www.zerodayinitiative.com/advisories/ZDI-22-1625/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.