Full Report
A now-fixed vulnerability in the open-source vulnerability scanner Nuclei could potentially allow attackers to bypass signature verification while sneaking malicious code into templates that execute on local systems. [...]
Analysis Summary
# Vulnerability: Nuclei Template Signature Check Bypass Leading to Command Execution
## CVE Details
- CVE ID: *Not explicitly provided in the snippet.*
- CVSS Score: *Not explicitly provided in the snippet.*
- CWE: *Not explicitly provided in the snippet.*
## Affected Systems
- Products: Nuclei (security scanning tool)
- Versions: *Versions prior to the patch release are likely affected.*
- Configurations: When using Nuclei templates, specifically those that leverage template signature checks.
## Vulnerability Description
A security flaw exists in the Nuclei scanning tool that allows an attacker to bypass template signature checks. This bypass enables an unauthenticated attacker to execute arbitrary commands on the vulnerable system running the Nuclei scanner, potentially leading to full system compromise depending on the privileges of the user running Nuclei.
## Exploitation
- Status: *Not explicitly stated if exploited in the wild, but a proof-of-concept (PoC) for bypassing signatures is implied.*
- Complexity: *Likely Low, given the function of bypassing security checks.*
- Attack Vector: *Likely depends on how the template is executed, but the goal is Remote Code Execution (RCE) capability.*
## Impact
- Confidentiality: High (Potential for full data exfiltration)
- Integrity: High (Potential for system modification or control)
- Availability: High (Potential for system outage or denial of service)
## Remediation
### Patches
- *Specific patch version numbers are not detailed in the provided text, but an update addressing the template signature bypass is required.*
### Workarounds
- *No specific workarounds are detailed in the provided text.* Users should prioritize patching immediately.
## Detection
- *Specific Indicators of Compromise (IOCs) are not detailed.*
- Detection methods would involve monitoring the Nuclei process for unexpected outbound network connections or deviations from expected command execution behavior within its scanning templates.
## References
- Vendor Advisories: *None explicitly linked or detailed due to nature of snippet.*
- Relevant Links:
- bleepingcomputer com/news/security/nuclei-flaw-bypasses-template-signature-checks-to-execute-commands/