Jeremy Brown has discovered two vulnerabilities in freeSSHd, which can be exploited by malicious users to cause a DoS (Denial of Service).
The vulnerabilities are caused due to NULL-pointer dereference errors in the processing of the SFTP "rename" and "realpath" commands. These can be exploited to crash a freeSSHd server via an overly long string passed as an argument to the affected commands.
The vulnerabilities are confirmed in version 126.96.36.199. Other versions may also be affected.
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Subject: freeSSHd Two Denial of Service Vulnerabilities
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