Security Advisory AA-001

Authentication Bypass Vulnerability in Conceptronic Grab’n’Go Network and Sitecom Home Storage Center

Security Advisory AA-002

Password disclosure Vulnerability in Conceptronic Grab’n’Go and Sitecom Home Storage Center

Security Advisory AA-003

Directory Traversal Vulnerability in Conceptronic Grab’n’Go Network Storage (0-day)

Security Advisory AA-004

Directory Traversal Vulnerability in Sitecom Home Storage Center

Security Advisory AA-005

Authorization Bypass Vulnerability in Password Reset Function Conceptronic Grab’n’Go Network Storage (0-day)

Security Advisory AA-006

Authorization Bypass Vulnerability in Password Reset Function Sitecom Home Storage Center

Security Advisory AA-007

Security Advisory AA-007: Arbitrary File Upload Vulnerability in Sitecom Home Storage Center

Security Advisory AA-008

Command Injection Vulnerability in Sitecom Home Storage Center

Responsible Disclosure

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Security Advisory AA-003: Directory Traversal Vulnerability in Conceptronic Grab’n’Go Network Storage (0-day)

Severity Rating: High
Discovery Date: July 29, 2012
Vendor Notification: July 30, 2012
Disclosure Date: September 3, 2012

Vulnerability Type

Directory Traversal

Impact

  • System Access
  • Exposure of sensitive information

Severity

Alcyon rates the severity of this vulnerability as high due to the following properties:

  • Ease of exploitation;
  • No authentication credentials required;
  • No knowledge about individual victims required;
  • No interaction with the victim required;
  • Number of Internet connected devices found.

Products and firmware versions affected

  • Conceptronic CH3ENAS all firmware versions up to and including 3.0.12
  • Conceptronic CH3HNAS all firmware versions up to and including to 2.4.13
  • Possibly other rebranded Mapower network storage products

Risk Assessment

An attacker can read arbitrary files, including the files that stores the administrative password. This means an attacer could:

  • Steal sensitive data stored on the device;
  • Leverage the device to drop and/or host malware;
  • Abuse the device to send spam through the victim’s Internet connection;
  • Use the device as a pivot point to access locally connected systems or launch attacks directed to other systems.

Vulnerability

The CGI-script that is responsible for showing the device logs is affected by a directory traversal vulnerability that allows an attacker to view arbitrary files.

Proof of Concept Exploit

curl "http://<victimIP>/cgi-bin/log.cgi?syslog&../../etc/sysconfig/config/webmaster.conf&Conceptronic2009"

Risk Mitigation

At the time of disclosure no updated firmware version was available. We recommend that you limit access to the devices's web management UI by utilizing proper packet filtering and/or NAT on your router in order to limit network access to your NAS. Although this will not completely eliminate the risk of exploitation, it becomes substantially more difficult to leverage a successful attack, because it would involve either a compromise of another host on the victim’s local network or a client side attack that overcomes the Same Origin Policy restrictions of the victim’s web browser.

Vendor Response

  • 2L/Conceptronic has declared on August 1 that it is not in their power to influence the manufacturer's patching process.
  • Mapower, the manufacturer of the affected products, has contacted us on August 28 for details on reproducing the issue on a CH3HNAS.
  • Mapower has confirmed on August 29 that they succesfully have reproduced the PoC exploit on a CH3HNAS and that they are working on a fix

Fixed Versions

There is currently no vendor patch available.