Plataforma
python
Componente
ansible
Corregido en
2.3.1.0
CVE-2017-7481 is a critical remote code execution (RCE) vulnerability affecting Ansible Automation Engine versions 2.1.6.0 and earlier, 2.2.3.0 and earlier, 2.3.0.0 and earlier. This flaw arises from Ansible's failure to properly mark lookup-plugin results as unsafe, enabling attackers to inject Unicode strings that are then parsed by the Jinja2 templating system. Successful exploitation can lead to arbitrary code execution on systems where Ansible is deployed.
The impact of CVE-2017-7481 is severe. An attacker who can control the results of Ansible's lookup() calls can inject malicious Unicode strings. These strings are then processed by the Jinja2 templating engine, potentially allowing the attacker to execute arbitrary code on the target system. This could lead to complete system compromise, data theft, or disruption of automated processes. The vulnerability's impact is amplified in environments where Ansible is used to manage critical infrastructure or sensitive data, as a successful attack could propagate across multiple systems. While the default Jinja2 templating language is now marked as 'unsafe', legacy configurations or custom plugins might still be vulnerable.
CVE-2017-7481 was publicly disclosed on September 6, 2018. While no widespread exploitation has been definitively confirmed, the vulnerability's critical severity and potential for remote code execution make it a high-priority target. The vulnerability is not currently listed on CISA KEV. Public proof-of-concept exploits are available, increasing the risk of exploitation.
Organizations heavily reliant on Ansible for infrastructure automation, particularly those using older versions (≤2.3.0.0), are at significant risk. Shared hosting environments where multiple users have access to Ansible configurations are also vulnerable, as an attacker could potentially compromise the entire environment through a single playbook.
• python / ansible:
Get-Process -Name ansible | Select-Object -ExpandProperty Path• python / ansible: Check Ansible playbook files for suspicious lookup plugin usage or untrusted data sources. • python / ansible: Monitor Ansible logs for errors related to Unicode parsing or Jinja2 template rendering. • python / ansible: Review Ansible configuration files for any custom filters or extensions that might be vulnerable. • python / ansible: Use a static analysis tool to scan Ansible playbooks for potential vulnerabilities.
disclosure
Estado del Exploit
EPSS
1.92% (83% percentil)
Vector CVSS
The primary mitigation for CVE-2017-7481 is to upgrade Ansible to version 2.3.1.0 or later, which addresses the vulnerability by properly marking lookup-plugin results as unsafe. If upgrading is not immediately feasible, consider implementing temporary workarounds such as restricting the sources from which Ansible retrieves data and carefully reviewing all lookup plugins for potential vulnerabilities. Additionally, ensure that Jinja2 templating is configured securely, and that any custom filters or extensions are thoroughly vetted. After upgrading, confirm the fix by attempting to trigger a lookup with a specially crafted Unicode string and verifying that it is properly sanitized.
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CVE-2017-7481 is a critical remote code execution vulnerability in Ansible versions up to 2.3.0.0. It allows attackers to inject malicious Unicode strings into Ansible playbooks, potentially leading to arbitrary code execution.
You are affected if you are using Ansible versions 2.1.6.0 and earlier, 2.2.3.0 and earlier, or 2.3.0.0 and earlier. Upgrade to 2.3.1.0 or later to mitigate the risk.
The recommended fix is to upgrade Ansible to version 2.3.1.0 or later. If upgrading is not immediately possible, implement temporary workarounds such as restricting data sources and reviewing lookup plugins.
While no widespread exploitation has been definitively confirmed, the vulnerability's critical severity and the availability of public proof-of-concept exploits suggest a potential for exploitation.
Refer to the Ansible security advisory for detailed information and mitigation guidance: https://www.ansible.com/security-advisories/a00004
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