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Hola VPN 1.79.859 - Insecure service permissions Vulnerability
[=====[ Tempest Security Intelligence - ADV-22/2018 ]=== Hola VPN 1.79.859 - Insecure service permissions ------------------------------------------------------- Author: - Filipe Xavier Oliveira: < filipe.xavier () tempest.com.br > =====[ Table of Contents ]===================================================== * Overview * Detailed description * Further attack scenarios * Timeline of disclosure * Thanks & Acknowledgements * References =====[ Overview ]============================================================== * System affected : Hola VPN [1] * Software Version : 1.79.859 .Other versions or models may also be affected. * Impact : An unprivileged user could modify or overwrite the executable with arbitrary code, which would be executed the next time the service is started. Resulting in privilege escalation. =====[ Detailed description ]================================================== An unprivileged user could modify or overwrite the executable with arbitrary code, which would be executed the next time the service is started. Depending on the user that the service runs as, this could result in privilege escalation. The issue exists because of the SERVICE_ALL_ACCESS access right for the hola_svc and hola_updater services. C:\SysinternalsSuite>accesschk.exe -uwcqv "Everyone" * RW hola_svc SERVICE_ALL_ACCESS RW hola_updater SERVICE_ALL_ACCESS =====[ Further attack scenarios ]============================================== Services configured to use an executable with weak permissions are vulnerable to privilege escalation attacks, any user can replace the original service by the another, causing elevation of privileges to SYSTEM =====[ Timeline of disclosure ]=============================================== 29/01/2018 - Vulnerability reported. Vendor did not respond. 02/05/2018 - CVE assigned [2] 02/05/2018 - Tried to contact vendor again, without success. 03/06/2018 - Advisory publication date. =====[ Thanks & Acknowledgements ]============================================ - Tempest Security Intelligence / Tempest's Pentest Team [1] =====[ References ]=========================================================== [1] - http://hola.org/ [2] - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6623 [3] - http://www.tempest.com.br/ -- Filipe Oliveira Tempest Security Intelligence # 0day.today [2024-11-15] #