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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

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

Severity Rating: High
Discovery Date: July 29, 2012
Vendor Notification: July 30, 2012
Disclosure Date: September 11, 2012
Disclosure Date: September 29, 2012

Vulnerability Type

Arbitrary file upload

Impact

Loss of system integrity

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.

Products and firmware versions affected

  • Sitecom MD-253 firmware version up to and including 2.4.17
  • Sitecom MD-254 firmware version up to and including 2.4.17
  • Possibly other rebranded Mapower network storage products

Risk Assessment

An attacker can upload arbitrary files to the device. Combining the command injection vulnerability described in advisory AA-008an attacker can obtain a remote root shell.

Vulnerability

The CGI executable that is responsible for handling firmware updates allows arbitrary files to be uploaded to the /tmp folder.Furthermore the files are automatically assigned execute permissions and are owned by root.

Proof of Concept Exploit

PoC code exploiting this and other vulnerabilities to obtain an interactive root shell can be found here

Risk Mitigation

Install the latest firmware version. If you are unable to upgrade you can opt to install our BasicAuth package as a workaround:

We recommend that you limit access to the web management UI of the device by utilizing proper packet filtering and/or NAT on your router in order to limit network access to your NAS. Note that this will not completely eliminate the risk of exploitation, since the product is affected by other vulnerabilities that can be leveraged using client side attacks.

Vendor responses

None

Fixed Versions

  • Firmware version 2.4.21

Latest version of this advisory

References

Security Advisory AA-008: Command Injection Vulnerability in Sitecom Home Storage Center