In support.c in pam_tacplus 1.3.8 through 1.5.1, the TACACS+ shared secret gets logged via syslog if the DEBUG loglevel and journald are used.

The remote Debian 9 host has a package installed that is affected by a vulnerability as referenced in the dla-2730 advisory.

    It was discovered that there was an issue in libpam-tacplus (a security module for using the TACACS+     authentication service) where shared secrets such as private server keys were being added in the clear to     various logs. For Debian 9 stretch, this problem has been fixed in version 1.3.8-2+deb9u1. We recommend     that you upgrade your libpam-tacplus packages. For the detailed security status of libpam-tacplus please     refer to its security tracker page at: https://security-tracker.debian.org/tracker/libpam-tacplus Further     information about Debian LTS security advisories, how to apply these updates to your system and frequently     asked questions can be found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-4521-1 advisory.

    It was discovered that pam_tacplus did not properly manage shared secrets if DEBUG loglevel and journald     are used. A remote attacker could use this issue to expose sensitive information.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

An update of the pam_tacplus package has been released.

It was discovered that there was an issue in libpam-tacplus (a security module for using the TACACS+ authentication service) where shared secrets such as private server keys were being added in the clear to various logs.

For Debian 8 'Jessie', this issue has been fixed in libpam-tacplus version 1.3.8-2+deb8u1.

We recommend that you upgrade your libpam-tacplus packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
152217	Debian DLA-2730-1 : libpam-tacplus - LTS security update	Nessus	Debian Local Security Checks	high
140701	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : pam_tacplus vulnerability (USN-4521-1)	Nessus	Ubuntu Local Security Checks	high
140408	Photon OS 3.0: Pam_Tacplus PHSA-2020-3.0-0134	Nessus	PhotonOS Local Security Checks	high
140125	Photon OS 1.0: Pam_Tacplus PHSA-2020-1.0-0319	Nessus	PhotonOS Local Security Checks	high
140117	Photon OS 2.0: Pam_Tacplus PHSA-2020-2.0-0280	Nessus	PhotonOS Local Security Checks	high
137248	Debian DLA-2239-1 : libpam-tacplus security update	Nessus	Debian Local Security Checks	high

Detections

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CVE-2020-13881

high

Tenable Plugins

high

high

high

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high