2021-3156 | Oracle MICROS Workstation 5A Sudo off-by-one

By Max On Jul 24, 2021

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7.5	$0-$5k	0.38

A vulnerability was found in Oracle MICROS Workstation 5A 5A. It has been declared as critical. This vulnerability affects some unknown processing of the component Sudo. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-193. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Sudo before 1.9.5p2 contains an off-by-one error that can result in a heap-based buffer overflow, which allows privilege escalation to root via “sudoedit -s” and a command-line argument that ends with a single backslash character.

The weakness was published 07/20/2021 as Oracle Critical Patch Update Advisory – July 2021. The advisory is shared for download at oracle.com. This vulnerability was named CVE-2021-3156 since 01/15/2021. The exploitation appears to be easy. The attack needs to be approached locally. Required for exploitation is a single authentication. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/24/2021).

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

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