Btrbk before 0.31.2 allows command execution because of the mishandling of remote hosts filtering SSH commands using ssh_filter_btrbk.sh in authorized_keys.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Btrbk before 0.31.2 allows command execution because of the mishandling of remote hosts filtering SSH     commands using ssh_filter_btrbk.sh in authorized_keys. (CVE-2021-38173)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote host is affected by the vulnerability described in GLSA-202402-32 (btrbk: Remote Code Execution)

  - Btrbk before 0.31.2 allows command execution because of the mishandling of remote hosts filtering SSH     commands using ssh_filter_btrbk.sh in authorized_keys. (CVE-2021-38173)

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

The remote Debian 9 host has a package installed that is affected by a vulnerability as referenced in the dla-2755 advisory.

    An issue has been found in btrbk, a backup tool for btrfs subvolumes. Due to mishandling of remote hosts     filtering SSH commands using ssh_filter_btrbk.sh in authorized_keys an arbitrary code execution would have     been allowed. For Debian 9 stretch, this problem has been fixed in version 0.24.0-1+deb9u1. We recommend     that you upgrade your btrbk packages. For the detailed security status of btrbk please refer to its     security tracker page at: https://security-tracker.debian.org/tracker/btrbk 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.

ID	Name	Product	Family	Severity
250401	Linux Distros Unpatched Vulnerability : CVE-2021-38173	Nessus	Misc.	critical
191002	GLSA-202402-32 : btrbk: Remote Code Execution	Nessus	Gentoo Local Security Checks	critical
153026	Debian DLA-2755-1 : btrbk - LTS security update	Nessus	Debian Local Security Checks	critical

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CVE-2021-38173

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