mcdope pam_usb up to 0.8.6 on Linux UUID os.system os command injection

Summaryinfo

A vulnerability has been found in mcdope pam_usb up to 0.8.6 on Linux and classified as critical. This impacts the function os.system of the component UUID Handler. The manipulation leads to os command injection. This vulnerability is documented as CVE-2026-44712. The attack needs to be performed locally. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in mcdope pam_usb up to 0.8.6 on Linux. It has been rated as critical. This issue affects the function os.system of the component UUID Handler. The manipulation with an unknown input leads to a os command injection vulnerability. Using CWE to declare the problem leads to CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.8.7, a crafted UUID such as $(id>/tmp/rce) in the config causes root RCE when pamusb-conf --reset-pads is run. A USB device with a crafted filesystem UUID (some controllers allow this) can inject the payload at --add-device time. Also, userName from the XML config is passed to os.system() in pamusb-agent, which invokes a shell. This vulnerability is fixed in 0.8.7.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-44712 since 05/07/2026. The exploitation is known to be easy. Attacking locally is a requirement. The exploitation needs additional levels of successful authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

Upgrading to version 0.8.7 eliminates this vulnerability.

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Productinfo

Vendor

• mcdope

Name

• pam_usb

Version

• 0.8.0
• 0.8.1
• 0.8.2
• 0.8.3
• 0.8.4
• 0.8.5
• 0.8.6

Website

• Product: https://github.com/mcdope/pam_usb/

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