Horizon Alert
Summary of the vulnerability and why it matters
The Sitecore.Security.AntiCSRF module within Sitecore CMS and Sitecore XP is vulnerable to an untrusted data deserialization flaw. This weakness allows an unauthenticated attacker to submit a specially crafted serialized .NET object. Successful exploitation could enable an attacker to execute arbitrary code on the affected systems.
- Vulnerable Sitecore security module
- Data deserialization failure
- Arbitrary code execution
Attack Path
How an attacker could exploit the issue
A deserialization vulnerability in a Sitecore security module allows an unauthenticated attacker to execute arbitrary code. This occurs when a serialized .NET object is sent within the `__CSRFTOKEN` HTTP POST parameter. Successful exploitation can lead to the execution of unauthorized code on the affected system, potentially impacting data integrity and system availability.
- Exposure condition: Web applications accessible via HTTP POST.
- Attacker starting point: Unauthenticated.
- Trigger and result: Sends serialized object, leading to code execution.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability in Sitecore CMS and Experience Platform allows an attacker to execute arbitrary code. The threat is significant because an attacker does not need any special privileges or access to exploit this flaw. It is classified as critical due to the potential for complete system compromise.
- Attacker skill level: Low
- Required access or conditions: None
- Business risk or urgency: Critical
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
Organizations should address the deserialization vulnerability in the Sitecore.Security.AntiCSRF module to mitigate the risk of arbitrary code execution. This vulnerability allows unauthenticated attackers to exploit a serialized .NET object sent via the __CSRFTOKEN parameter. The critical severity and network accessibility of this flaw necessitate immediate attention to protect systems and data.
- Identify Sitecore CMS and Experience Platform assets.
- Reduce exposure or isolate affected systems.
- Apply vendor fixes, verify, and monitor.
