A vulnerability has been found in ROS Actionlib actionlib/tools/library.py:132 and classified as critical. Affected by this vulnerability is the function yaml.safe_load in the library actionlib/tools/library.py:132 of the component yaml Loader. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Use of unsafe yaml load. Allows instantiation of arbitrary objects. The flaw itself is caused by an unsafe parsing of YAML values which happens whenever an action message is processed to be sent, and allows for the creation of Python objects. Through this flaw in the ROS core package of actionlib, an attacker with local or remote access can make the ROS Master, execute arbitrary code in Python form. Consider yaml.safe_load() instead. Located first in actionlib/tools/library.py:132. See links for more info on the bug.

The weakness was released 08/20/2020 (GitHub Repository). It is possible to read the advisory at github.com. This vulnerability is known as CVE-2020-10289 since 03/10/2020. The attack can be launched remotely. A single authentication is necessary for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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• ROS

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• Actionlib

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• actionlib
• library.py:132
• tools

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