CVE-2019-10156
Information Disclosure vulnerability in ansible (PyPI)
What is CVE-2019-10156 About?
This vulnerability in Ansible templating allows for information disclosure through unexpected variable substitution. Attackers can exploit this flaw to reveal the content of any variable. Exploitation is relatively easy once the vulnerability is understood, as it relies on how templates process variables.
Affected Software
- ansible
- >=2.8.0a1, <2.8.2
- <2.6.18
- >=2.7.0a1, <2.7.12
Technical Details
The flaw resides in how Ansible templating engine processes variables in versions before 2.6.18, 2.7.12, and 2.8.2. Specifically, unexpected variable substitution occurs, meaning that a variable intended to hold one value might inadvertently reveal the content of another. An attacker could craft input or template definitions that trigger this substitution, leading to the disclosure of sensitive information stored in Ansible variables. This could involve manipulating the context in which templates are rendered to force the engine to substitute a variable with an unintended, potentially sensitive, value.
What is the Impact of CVE-2019-10156?
Successful exploitation may allow attackers to gain unauthorized access to sensitive data, such as credentials, configuration details, or other confidential information processed by Ansible. This could lead to further compromise of systems managed by Ansible.
What is the Exploitability of CVE-2019-10156?
Exploitation of this vulnerability would likely involve crafting specific Ansible templates or inputs that trigger the unexpected variable substitution. This would require an attacker to have some level of access to the Ansible environment, such as the ability to create or modify playbooks or template files. No specific authentication is mentioned, implying that if an attacker has the necessary access to the Ansible configuration or execution environment, they could exploit this. The complexity level is moderate, as it requires understanding Ansible's templating specifics. It is likely a local or authenticated remote exploit, depending on how Ansible is deployed and managed.
What are the Known Public Exploits?
| PoC Author | Link | Commentary |
|---|---|---|
| No known exploits | ||
What are the Available Fixes for CVE-2019-10156?
Available Upgrade Options
- ansible
- <2.6.18 → Upgrade to 2.6.18
- ansible
- >=2.7.0a1, <2.7.12 → Upgrade to 2.7.12
- ansible
- >=2.8.0a1, <2.8.2 → Upgrade to 2.8.2
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Book a demoAdditional Resources
- https://access.redhat.com/errata/RHSA-2019:3744
- https://lists.debian.org/debian-lts-announce/2019/09/msg00016.html
- https://github.com/pypa/advisory-database/tree/main/vulns/ansible/PYSEC-2019-2.yaml
- https://lists.debian.org/debian-lts-announce/2021/01/msg00023.html
- https://github.com/ansible/ansible
- https://github.com/ansible/ansible/pull/57188
- https://www.debian.org/security/2021/dsa-4950
- https://osv.dev/vulnerability/PYSEC-2019-2
- https://access.redhat.com/errata/RHSA-2019:3789
- https://access.redhat.com/errata/RHSA-2019:3744
What are Similar Vulnerabilities to CVE-2019-10156?
Similar Vulnerabilities: CVE-2020-7021 , CVE-2021-36224 , CVE-2018-1000873 , CVE-2022-23491 , CVE-2023-45803
