Amanda 3.3.1 Backup runtar Argument command injection

Summaryinfo

A vulnerability has been found in Amanda 3.3.1 and classified as critical. This affects an unknown part of the file runtar of the component Backup Handler. Performing a manipulation as part of Argument results in command injection. This vulnerability is cataloged as CVE-2016-10729. The attack must be initiated from a local position. Furthermore, there is an exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical has been found in Amanda 3.3.1. This affects an unknown part of the file runtar of the component Backup Handler. The manipulation as part of a Argument leads to a command injection vulnerability. CWE is classifying the issue as CWE-77. The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in Amanda 3.3.1. A user with backup privileges can trivially compromise a client installation. The "runtar" setuid root binary does not check for additional arguments supplied after --create, allowing users to manipulate commands and perform command injection as root.

The bug was discovered 01/11/2016. The weakness was shared 10/24/2018 as EDB-ID 39217 as not defined exploit (Exploit-DB). It is possible to read the advisory at exploit-db.com. This vulnerability is uniquely identified as CVE-2016-10729 since 10/24/2018. Attacking locally is a requirement. No form of authentication is needed for exploitation. Technical details and a public exploit are known. The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

After immediately, there has been an exploit disclosed. The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 1017 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 119026 (openSUSE Security Update : amanda (openSUSE-2018-1421)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171903 (OpenSUSE Security Update for amanda (openSUSE-SU-2018:3804-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 4 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (39217) and Tenable (119026). The entry VDB-125920 is related to this item. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

• Amanda

Version

• 3.3.1

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