Staog
Template:Short description Staog was the first computer virus written for the Linux operating system. It was discovered in the autumn, October 20, of 1996,<ref>Template:Cite web</ref> and the vulnerabilities that it exploited were fixed soon after. It has not been detected in the wild since its initial outbreak.<ref name="Piccard">Template:Cite book</ref> The vulnerabilities exploited by Staog have been patched in all major Linux distributions, making the virus no longer a threat.<ref>Template:Cite web</ref><ref name="Piccard" />
Staog manages to undermine the root access of the infected Linux system via three known kernel vulnerabilities: mount buffer overflow, tip buffer overflow and one suidperl bug,<ref name=":0">Template:Cite web</ref> which allow it to remain resident on the system. Then, it would infect executed binaries.<ref name="Piccard"/> For tip command, since in early versions of Linux, it was often installed as a setuid root binary, which means it ran with root privileges even when executed by a normal user.<ref>Template:Cite web</ref> Staog took advantage of that, along with the buffer overflow in tip to gain root privilege access to the system.
Staog was written in assembly language by an Australian hacker group VLAD,<ref name="Piccard"/><ref name="Salomon">Template:Cite book</ref> who are also known for the first Windows 95 virus, Boza.<ref name=":0" /><ref>Template:Cite web</ref>
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