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CVE-2016-20009: Windriver Vxworks: Buffer overflow

CVE-2016-20009 is rated critical with a CVSS v3.1 base score of 9.8 and affects Windriver Vxworks, along with 7 other products in NVD’s configuration data. Per its scoring, it can be exploited over the network, without authentication, without any user interaction. The scored impact on confidentiality, integrity and availability is the highest available.

Vulnerability description

A DNS client stack-based buffer overflow in ipdnsc_decode_name() affects Wind River VxWorks 6.5 through 7. NOTE: This vulnerability only affects products that are no longer supported by the maintainer

Severity breakdown

CVSS v3.1 9.8: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
Attack complexity: Low. No special conditions; the attack can be repeated reliably.
Privileges required: None. No account or prior access is needed.
User interaction: None. No action from any user is needed.
Scope: Unchanged. Impact stays within the vulnerable component.
Confidentiality impact: High. Total loss of confidentiality; sensitive data can be fully disclosed.
Integrity impact: High. Total loss of integrity; data or system state can be fully modified.
Availability impact: High. Total loss of availability; the component can be shut down.

Underlying weakness

CWE-787: Out-of-bounds Write

The product writes data past the end, or before the beginning, of the intended buffer.

Affected products

Windriver Vxworks: from 6.5 up to and including 7.0
Siemens Sgt 100 Firmware: all versions listed by NVD
Siemens Sgt 200 Firmware: all versions listed by NVD
Siemens Sgt 300 Firmware: all versions listed by NVD
Siemens Sgt 400 Firmware: all versions listed by NVD
Siemens Sgt A20 Firmware: all versions listed by NVD
Siemens Sgt A35 Firmware: all versions listed by NVD
Siemens Sgt A65 Firmware: all versions listed by NVD