2021-3156 | Oracle MICROS Compact Workstation 3 Sudo off-by-one

By Max On Jul 24, 2021

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7.5	$0-$5k	0.30

A vulnerability has been found in Oracle MICROS Compact Workstation 3 310 and classified as critical. Affected by this vulnerability is an unknown part 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. The summary by CVE is:

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 disclosed 07/20/2021 as Oracle Critical Patch Update Advisory – July 2021. The advisory is shared at oracle.com. This vulnerability is known as CVE-2021-3156 since 01/15/2021. The exploitation appears to be easy. An attack has to be approached locally. A single authentication is necessary for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (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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