Przemyslaw Frasunek has reported some vulnerabilities in tnftpd (also known as lukemftpd), which potentially can be exploited by malicious users to gain escalated privileges or compromise a vulnerable system.
The vulnerabilities are caused due to various race condition errors within the out-of-band signal handling code.
Successful exploitation may allow execution of FTP commands or arbitrary code with the privileges of the tnftpd process.
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Subject: tnftpd Signal Handling Privilege Escalation Vulnerabilities
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