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Home > Cybersecurity > 10-year-old Sudo vulnerability found in most Linux distros

10-year-old Sudo vulnerability found in most Linux distros

Qualys announced that they discovered a 10-year-old Sudo bug that can be exploited to gain root access.

Erdem Yasar by Erdem Yasar
January 27, 2021
in Cybersecurity, Linux
2 min read
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According to the Qualys’ report, a new Sudo bug was discovered and patched with the Sudo v1.9.5p2 release. CVE identifier for the vulnerability is CVE-2021-3156, but it is commonly known as “Baron Samedit”. According to the Sudo team’s announcement, the vulnerability can be exploited by a low-privileged user to gain root access, even if it isn’t listed in the config file that includes the usernames which are allowed access to su or sudo commands.

Technical details

According to details shared by the Qualys, if a sudo runs a command in shell mode, either via the -s or -i command-line option, it escapes special characters in the command’s arguments with a backslash. If the command is being run in shell mode, the escape characters will be removed from the arguments before evaluating the sudoers policy by the sudoers policy plugin.

 

Since sudo has escaped all the backslashes in the command’s argument, the bug would be harmless. However, due to another bug, it is possible to run sudoedit with either the -s or -i options, setting a flag that indicates shell mode is enabled. In the end, the code that decides whether to remove the escape characters did not check whether a command is actually being run, just that the shell flag is set.

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Tags: Linux DistroQualysVulnerability
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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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