#VU58122 Deserialization of Untrusted Data in Sitecore XP - CVE-2021-42237

Vulnerability identifier: #VU58122

Vulnerability risk: High

CVSSv4.0: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2021-42237

CWE-ID: CWE-502

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Sitecore XP
Web applications / CMS

Vendor: Sitecore

Description

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

The vulnerability exists due to insecure input validation when processing serialized data in the Report.ashx file. A remote attacker 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 updates from vendor's website.

Vulnerable software versions

Sitecore XP: 7.5 - 8.2

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External links
https://sitecore.com
https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1000776
https://blog.assetnote.io/2021/11/02/sitecore-rce/

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?