PT-2013-52: XML External Entities Injection in Huawei SGSN USN9810 Vulnerable platformHuawei SGSN USN9810Link: http://www.huawei.com/Severity levelSeverity level: Medium Impact: Internal Network Resources and File System Access, Denial of Service Access Vector: Remote CVSS v2: Base Score: 5.8 Vector: (AV:N/AC:M/Au:N/C:P/I:N/A:P)CVE: not assignedPlatform descriptionHuawei SGSN USN9810 is a unified service node designed by Huawei. It can be used in the 2.5G General Packet Radio Service (GPRS) system, 3G Universal Mobile Telecommunications System (UMTS), and evolved packet core (EPC) system.Vulnerability descriptionThe specialists of the Positive Research center have detected an XML External Entities Injection vulnerability in Huawei SGSN USN9810.An XML document may contain a Document Type Definition that, among other features, allows the definition of external entities. A malicious user may perform attacks aimed at reading arbitrary files, creating a denial of service condition, scanning the demilitarized zone, etc. How to fixCustomers can contact the Huawei Technical Assistance Center (TAC) to request upgradesAdvisory status 17.05.2013 - Vendor gets vulnerability details 31.07.2013 - Vendor releases fixed version and details 05.02.2014 - Public disclosureCreditsThe vulnerability was detected by Kirill Ermakov and Kirill Mosolov, Positive Research Center (Positive Technologies Company)Referenceshttp://en.securitylab.ru/lab/PT-2013-52 Reports on the vulnerabilities previously discovered by Positive Research:http://www.ptsecurity.com/research/advisory/ http://en.securitylab.ru/lab/