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Home > Cybersecurity > Sudo Bug lets users run commands as Root

Sudo Bug lets users run commands as Root

Apple Security member Joe Vennix found another critical vulnerability in Sudo which may affect Linux and macOS systems.


Erdem Yasar Erdem Yasar
February 4, 2020
2 min read
Sudo Bug lets users run commands as Root

Sudo is basically is a core command system that is pre-installed on macOS and UNIX or Linux-based operating systems. Thus, it is a very important part of the operating system. Joe Vennix of the Apple security team has found an important vulnerability in Sudo that under a specific configuration could allow low privileged users to execute arbitrary commands with root privileges. The privilege escalation vulnerability can now be tracked as CVE-2019-18634.

Disable pwfeedback

Vennix announced that the vulnerability can only be exploited when the “pwfeedback” option is enabled in the sudoers configuration file, a feature that provides visual feedback, an asterisk (*), when a user inputs password in the terminal. Luckily, pwfeedback feature is not enabled by default in the upstream version of Sudo, but in some Linux distributions, it is enabled in their default sudoers files. Users can check whether the pwfeedback is enabled or not by running “sudo -l” command on the terminal. Sudo versions 1.7.1 to 1.8.25p1 inclusive are affected. 1.8.30 it is not exploitable due to a change in EOF handling introduced in Sudo 1.8.26.

Sudo developer Todd Miller explained in a post,

“Exploiting the bug does not require sudo permissions, merely that pwfeedback be enabled. The bug can be reproduced bypassing a large input to Sudo via a pipe when it prompts for a password. The pwfeedback option is not ignored, as it should be when reading from something other than a terminal device. Due to the lack of a terminal, the saved version of the line erases character remains at its initialized value of 0. The code that erases the line of asterisks does not properly reset the buffer position if there is a write error, but it does reset the remaining buffer length. As a result, the getln() function can write past the end of the buffer.”

See more Cybersecurity News


Tags: macOSVulnerability
Erdem Yasar

Erdem Yasar

Erdem Yasar is a news editor at Cloud7 News. Erdem started his career by writing video game reviews in 2007 for PC World magazine while he was studying computer engineering. In the following years, he focused on software development with various programming languages. After his graduation, he continued to work as an editor for several major tech-related websites and magazines. During the 2010s, Erdem Yasar shifted his focus to cloud computing, hosting, and data centers as they were becoming more popular topics in the tech industry. Erdem Yasar also worked with various industry-leading tech companies as a content creator by writing blog posts and other articles. Prior to his role at Cloud7 News, Erdem was the managing editor of T3 Magazine.

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