PT-2013-55: Access Restrictions Bypassing in Huawei SGSN USN9810 Vulnerable platformHuawei SGSN USN9810Link: http://www.huawei.com/Severity levelSeverity level: Medium Impact: Information Disclosure Access Vector: Remote CVSS v2: Base Score: 5.4 Vector: (AV:N/AC:H/Au:N/C:C/I:N/A:N)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 Access Restrictions Bypassing vulnerability in Huawei SGSN USN9810.The platform does not provide sufficient entropy in session identifiers. This allows an attacker to brute force the current ID to bypass the authorization mechanisms and thus obtain access to the administrator session.How to fixCustomers can contact the Huawei Technical Assistance Center (TAC) to request upgradesAdvisory status 29.05.2013 - Vendor gets vulnerability details 31.07.2013 - Vendor releases fixed version and details 05.02.2014 - Public disclosureCreditsThe vulnerability was detected by Timur Yunusov, Alexey Osipov and Gleb Gritsai, Positive Research Center (Positive Technologies Company)Referenceshttp://en.securitylab.ru/lab/PT-2013-55 Reports on the vulnerabilities previously discovered by Positive Research:http://www.ptsecurity.com/research/advisory/ http://en.securitylab.ru/lab/
