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CVE-2020-1733

MEDIUMCVSS 5/10EPSS 0.40%

Last modified

CVE-2020-1733 is a medium-severity vulnerability rated 5/10 on the CVSS scale. 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. EPSS estimates a 0.40% chance of exploitation in the next 30 days.

Description

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'.

Metrics

CVSS 3.1
5/10

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L

EPSS Probability
0.40%

31.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
RedhatAnsible<= 2.7.16
RedhatAnsible>= 2.8.0, < 2.8.8
RedhatAnsible>= 2.9.0, <= 2.9.5
RedhatAnsible Tower<= 3.3.4
RedhatAnsible Tower>= 3.3.5, <= 3.4.5
RedhatAnsible Tower>= 3.5.0, <= 3.5.5
RedhatAnsible Tower>= 3.6.0, <= 3.6.3
RedhatCloudforms Management Engine5.0
RedhatOpenstack13
FedoraprojectFedora30
FedoraprojectFedora31
FedoraprojectFedora32
DebianDebian Linux8.0
DebianDebian Linux10.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-1733?
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'.
How severe is CVE-2020-1733?
CVE-2020-1733 has a CVSS score of 5/10 (MEDIUM severity). The EPSS model estimates a 0.40% probability of exploitation in the next 30 days.
How do I fix CVE-2020-1733?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST