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GHSA-g4mq-6fp5-qwcf

Ansible vulnerable to Exposure of Resource to Wrong Sphere and Insecure Temporary File

Source: GitHub Advisory Database (reviewed) Low CVE-2020-1733

Packages

EcosystemPackageAffectedFixed in
PyPI ansible < 2.7.17 2.7.17
PyPI ansible >= 2.8.0a1, < 2.8.11 2.8.11
PyPI ansible >= 2.9.0a1, < 2.9.7 2.9.7

Details

As written in the advisory (Markdown source, shown as plain text).

A race condition flaw was found in Ansible Engine 2.7.17 and prior, 2.8.9 and prior, 2.9.6 and prior when running a playbook with an unprivileged become user. When Ansible needs to run a module with become user, the temporary directory is created in /var/tmp. This directory is created with "umask 77 && mkdir -p <dir>"; this operation does not fail if the directory already exists and is owned by another user. An attacker could take advantage to gain control of the become user as the target directory can be retrieved by iterating '/proc/<pid>/cmdline'.

References

External links from the advisory. They lead to third-party sites.