Advisory Details

December 20th, 2017

QNAP QTS NASFTPD USER Stack-based Buffer Overflow Remote Code Execution Vulnerability

CVE ID	CVE-2017-17027
CVSS SCORE	10.0, AV:N/AC:L/Au:N/C:C/I:C/A:C
AFFECTED VENDORS	QNAP
AFFECTED PRODUCTS	QTS
VULNERABILITY DETAILS	This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of QNAP QTS NASFTPD. Authentication is not required to exploit this vulnerability. The specific flaw exists within the NASFTPD service, which listens on TCP port 21 by default. When parsing the USER command, the process does not properly validate the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code under the context of root.
ADDITIONAL DETAILS	QNAP has issued an update to correct this vulnerability. More details can be found at: https://www.qnap.com/en/security-advisory/nas-201712-15
DISCLOSURE TIMELINE	2017-09-19 - Vulnerability reported to vendor 2017-12-20 - Coordinated public release of advisory
CREDIT	Peter Andersson (@nervoir)

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