CVE Vulnerabilities

CVE-2021-42237

Deserialization of Untrusted Data

Published: Nov 05, 2021 | Modified: Apr 03, 2025
CVSS 3.x
9.8
CRITICAL
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
10 HIGH
AV:N/AC:L/Au:N/C:C/I:C/A:C
RedHat/V2
RedHat/V3
Ubuntu

Sitecore XP 7.5 Initial Release to Sitecore XP 8.2 Update-7 is vulnerable to an insecure deserialization attack where it is possible to achieve remote command execution on the machine. No authentication or special configuration is required to exploit this vulnerability.

Weakness

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Affected Software

Name Vendor Start Version End Version
Experience_platform Sitecore 7.5 (including) 7.5 (including)
Experience_platform Sitecore 7.5-update1 (including) 7.5-update1 (including)
Experience_platform Sitecore 7.5-update2 (including) 7.5-update2 (including)
Experience_platform Sitecore 8.0 (including) 8.0 (including)
Experience_platform Sitecore 8.0-sp1 (including) 8.0-sp1 (including)
Experience_platform Sitecore 8.0-update1 (including) 8.0-update1 (including)
Experience_platform Sitecore 8.0-update2 (including) 8.0-update2 (including)
Experience_platform Sitecore 8.0-update3 (including) 8.0-update3 (including)
Experience_platform Sitecore 8.0-update4 (including) 8.0-update4 (including)
Experience_platform Sitecore 8.0-update5 (including) 8.0-update5 (including)
Experience_platform Sitecore 8.0-update6 (including) 8.0-update6 (including)
Experience_platform Sitecore 8.0-update7 (including) 8.0-update7 (including)
Experience_platform Sitecore 8.1 (including) 8.1 (including)
Experience_platform Sitecore 8.1-update1 (including) 8.1-update1 (including)
Experience_platform Sitecore 8.1-update2 (including) 8.1-update2 (including)
Experience_platform Sitecore 8.1-update3 (including) 8.1-update3 (including)
Experience_platform Sitecore 8.2 (including) 8.2 (including)
Experience_platform Sitecore 8.2-update1 (including) 8.2-update1 (including)
Experience_platform Sitecore 8.2-update2 (including) 8.2-update2 (including)
Experience_platform Sitecore 8.2-update3 (including) 8.2-update3 (including)
Experience_platform Sitecore 8.2-update4 (including) 8.2-update4 (including)
Experience_platform Sitecore 8.2-update5 (including) 8.2-update5 (including)
Experience_platform Sitecore 8.2-update6 (including) 8.2-update6 (including)
Experience_platform Sitecore 8.2-update7 (including) 8.2-update7 (including)

Potential Mitigations

  • Make fields transient to protect them from deserialization.
  • An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.

References