ntop-ng Authentication bypass (CVE-2018-12520) # Product Details
ntopng is the next generation version of the original ntop, a network traffic probe that shows the network usage, similar to what the popular top Unix command does. ntopng is based on libpcap and it has been written in a portable way in order to virtually run on every Unix platform, MacOSX and on Windows as well. # Vulnerability Details An issue was discovered in ntopng 3.4. The PRNG involved in the generation of session IDs is not seeded at program startup. This results in deterministic session IDs being allocated for active user sessions. An attacker with foreknowledge of the operating system and standard library in use by the host running the service and the username of the user whose session they're targeting can abuse the deterministic random number generation in order to hijack the user's session, thus escalating their access. # Exploit A proof-of-concept for this vulnerability can be found at https://gist.github.com/Psychotropos/3e8c047cada9b1fb716e6a014a428b7f. Note that this script has been tested with Python 2.7, and requires the 'requests' module, which can be found in the Python Package Index. # Mitigation Upgrade to the latest stable version of ntop-ng 3.4. # Attack Type Remote, Unauthenticated, Escalation of Privileges, Information Disclosure # Advisory Timeline 17/06/2018 - Reported issue to ntop-ng security team, received CVE allocation (CVE-2018-12520), vendor acknowledged the issue and issued a patch/updated their package repository with a patched version of the software. 02/07/2018 - Full Disclosure # References https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12520 https://github.com/ntop/ntopng/commit/30610bda60cbfc058f90a1c0a17d0e8f4516221a _______________________________________________ Sent through the Full Disclosure mailing list https://nmap.org/mailman/listinfo/fulldisclosure Web Archives & RSS: http://seclists.org/fulldisclosure/