A vulnerability, which was classified as critical, has been found in LTSP LDM up to 2.18.06. Affected by this issue is an unknown functionality of the component Shell. The manipulation of the argument LDM_USERNAME with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability. CVE summarizes:

LTSP LDM through 2.18.06 allows fat-client root access because the LDM_USERNAME variable may have an empty value if the user's shell lacks support for Bourne shell syntax. This is related to a run-x-session script.

The weakness was published 01/09/2020. This vulnerability is handled as CVE-2019-20373 since 01/09/2020. The attack needs to be approached locally. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

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

Similar entries are available at VDB-106498, VDB-107731, VDB-121801 and VDB-127854.

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• LTSP LDM

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• 2.18.06

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