cve-search - a free software to collect, search and analyse common vulnerabilities and exposures in software Freedom #0 in action

Transcription

1 cve-search - a free software to collect, search and analyse common vulnerabilities and exposures in software Freedom #0 in action Alexandre Dulaunoy alexandre.dulaunoy@circl.lu 20th December 2013

2 What we were looking for? Local search of common vulnerabilities and exposures ( avoid searching NIST/US for your current vulnerable software...). Fast-lookup of vulnerabilities (e.g. live evaluation of network traffic for vulnerable software). Allow localized classification of vulnerabilities (e.g. classify software following your exposure). Flexible data structure (e.g. NIST/NVD is not the only source). Allowing the use of Unix-like tools to process the vulnerabilities. 2 of 19

3 History of cve-search 3 of 19

4 A functional overview of cve-search (populating database(s) db mgmt.py fetch NVD/CVE from NIST db updater.py index n last new CVE db fulltext.py Whoosh index db mgmt cpe dictionnary.py fetch CPE from NIST MongoDB cve cpe ranking info db dump.py 4 of 19

5 A functional overview of cve-search (tools) MongoDB cve cpe ranking info Whoosh index search fulltext.py search.py dump last.py search xmpp.py 5 of 19

6 cve-search starting up... Import and update of the CVE/NVD and CPE database: 1 % python3. 3 d b u p d a t e r. py v i Search CVE of a specific vendor (via CPE): 1 % python3. 3 s e a r c h. py p joomla : CVE CVE CVE CVE CVE CVE of 19

7 cve-search simple query and JSON output 1 s e a r c h. py c CVE n 2 { M o d i f i e d : T13 : 0 1 : : 0 0, P u b l i s h e d : T20 : 5 5 : : 0 0, i d : { $ o i d : 514 cce0db fa3f211 }, c v s s : 5. 0, i d : CVE , r e f e r e n c e s : [ h t t p : / / x f o r c e. i s s. net / x f o r c e / xfdb /81926, h t t p : / / d e v e l o p e r. joomla. org / s e c u r i t y / news / core i n f o r m a t i o n d i s c l o s u r e. html ], summary : Joomla! x through a l l o w s a t t a c k e r s to o b t a i n s e n s i t i v e i n f o r m a t i o n v i a u n s p e c i f i e d v e c t o r s r e l a t e d to an \ U ndefined v a r i a b l e. \, v u l n e r a b l e c o n f i g u r a t i o n : [ Joomla! , Joomla! ] } Without CPE name lookup: 1 v u l n e r a b l e c o n f i g u r a t i o n : [ cpe : / a : joomla : joomla % 2 1 : , cpe : / a : joomla : joomla % 2 1 : ] } 7 of 19

8 CPE - an overview 1 cpe : / { p a r t } : { vendor } : { p r o d u c t } : { v e r s i o n } : { update } : { e d i t i o n } : { l a n g u a g e } part o a h name Operating System Application Hardware An empty part defines any element. CPE are updated at a regular interval by NIST but it happens that CPE dictionnary are updated afterwards. 8 of 19

9 Which are the top vendors using the word unknown? 1 s e a r c h f u l l t e x t. py q unknown f j q r.. v u l n e r a b l e c o n f i g u r a t i o n [ 0 ] cut f 3 d : s o r t u n i q c s o r t nr head 10 9 of 19 Count CPE vendor name 1145 oracle 367 sun 327 hp 208 google 192 ibm 113 mozilla 102 microsoft 98 adobe 76 apple 68 linux

10 Which are the top products using the word unknown? 1 s e a r c h f u l l t e x t. py q unknown f j q r.. v u l n e r a b l e c o n f i g u r a t i o n [ 0 ] cut f3, 4 d : s o r t u n i q c s o r t nr head of 19 Count CPE vendor/product name 191 oracle:database server 189 google:chrome 115 oracle:e-business suite 111 sun:jre 101 mozilla:firefox 99 oracle:fusion middleware 95 oracle:application server 80 sun:solaris 68 linux:linux kernel 61 sun:sunos

11 oracle:java versus sun:jre 1 s e a r c h. py p o r a c l e : j a v a o j s o n j q r. cvss R s c r i p t e summary ( as. numeric ( read. t a b l e ( f i l e ( s t d i n ) ) [, 1 ] ) ) 2 3 Min. 1 s t Qu. Median Mean 3 rd Qu. Max s e a r c h. py p sun : j r e o j s o n j q r. c v ss R s c r i p t e summary ( as. numeric ( read. t a b l e ( f i l e ( s t d i n ) ) [, 1 ] ) ) 7 8 Min. 1 s t Qu. Median Mean 3 rd Qu. Max of 19

12 Ranking of vulnerabilities 1 d b r a n k i n g. py c sap : g a c c o u n t i n g r 3 2 s e a r c h. py c CVE o j s o n r 3... c v s s : , i d : CVE , r a n k i n g : [ [ { a c c o u n t i n g : 3 } ] ]... Ranking is simple and flexible. If you are a CSIRT, you can use your own tagging to weight the critical software/vendor in your constituency. 12 of 19

13 Ranking helping for internal publishing of vulnerabilities dump last.py can be used to generate an overview of the current/recent vulnerabilities in your organization. You can limit the result to the ranked software to avoid non-related software vulnerabilities. 1 d u m p l a s t. py r l 100 f html 2 d u m p l a s t. py r l 100 f atom 13 of 19

14 search fulltext.py -g -s 14 of 19

15 Freedom #0 FSF Style: The freedom to run the program, for any purpose (freedom 0). Debian Style: No Discrimination Against Fields of Endeavor 15 of 19

16 Can cve-search be used by bad guys? If you know that system is vulnerable, you have two options: If you are a good guy, you inform the system owner to fix the vulnerability. If you are a bad guy, you abuse your position and compromise the vulnerable system. cve-search could help both guys. 16 of 19

17 Where and how to infect random systems? TorInj research project 17 of 19

18 TorInj research project and cve-search In the initial version of TorInj, the vulnerabilities of the web browsers per client was evaluated offline. We were missing a tool to quickly lookup vulnerability per client and find an appropriate automatic exploitation. Next version of TorInj is relying on cve-search to do real-time vulnerability lookup, queue and try automatic exploitation. The objective of the research is show to the importance of using end-to-end authenticated encrypted communication with Tor and only with up-to-date software. 18 of 19

19 Freedom #0 is important. Free software developed for an initial purpose (from defensive to offensive) can be redirected to a new one. Looking for open data source of software vulnerabilities to integrate in cve-search. Dataset of cve-search can be requested with localized ranking (e.g. per country/region). Fork it, abuse it and then send pull request 19 of 19