Local account takeover via temporary-directory race
Published Mar 11, 2020 · Updated Aug 4, 2024
Race condition in Red Hat Ansible Engine 2.7.16 and earlier, 2.8.10 and earlier, and 2.9.6 and earlier allows local users to hijack become users. The POSIX shell plugin uses mkdir -p for the final /var/tmp module directory, accepts a directory pre-created by another user, and then reuses that attacker-owned path. Exploitation requires access to the managed Linux node, visibility into the playbook process through /proc, and an unprivileged become operation; success grants control of the become account and permits changes to files owned by the connecting SSH user.
Summary
What happened
Race condition in Red Hat Ansible Engine 2.7.16 and earlier, 2.8.10 and earlier, and 2.9.6 and earlier allows local users to hijack become users. The POSIX shell plugin uses mkdir -p for the final /var/tmp module directory, accepts a directory pre-created by another user, and then reuses that attacker-owned path. Exploitation requires access to the managed Linux node, visibility into the playbook process through /proc, and an unprivileged become operation; success grants control of the become account and permits changes to files owned by the connecting SSH user.
The record
- CVE
- CVE-2020-1733
- Published
- Mar 11, 2020
- Updated
- Aug 4, 2024
- Vendor
- Red Hat
- Product
- Ansible
- Classifications
- CWE-377, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 11, 2020CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.7.17 and prior
- Affected versionversion=2.8.9 and prior
- Affected versionversion=2.9.6 and prior
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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