USN-4552-3: Pam-python regression

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Ubuntu security notices

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USN-4552-1 and USN-4552-2 fixed a vulnerability in Pam-python. The update introduced a regression which prevented PAM modules written in Python from importing python modules from site-specific directories. We apologize for the inconvenience. Original advisory details: Malte Kraus discovered that Pam-python mishandled certain environment variables. A local attacker could potentially use this vulnerability to execute programs as root.

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