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Posted on February 8th, 2009
Very short version in english:
You can see the results of a 2 weeks xss attack using a social network. The attacker used a permanent xss in hi5.com profiles to hide a Yahoo cookie stealer. Anyone logged in yahoo web services who visited the affected profile was affected by the “evil” iframe.
Both vulns are patched now, but the clip is still very interesting.
Inca de la inceputul blogului am incercat sa explicam cat de periculoase pot fi vulnerabilitatile in retelele sociale. Foarte multi nu pricep ca vulnerabilitatile xss pot fi o metoda eficienta de a capata date confidentiale intr-un mod elegant si greu de detectat, iar cand retelele sociale mari permit injectarea scripturilor mii de persoane pot fi afectate fara a avea macar idee ca cineva le-a spart conturile de mail, bancare, sau conturile din orice alt serviciu online afectat de o vulnerabilitate xss.
Ideea acestui articol mi-a venit datorita urmatorului comentariu aflat aici

Daca ar fi atat de ineficient nu am vorbi despre asta. Cand vorbim de xss permanent situatia se schimba. Nu doar acel site poate fi afectat, ci orice alt site vulnerabil la cross site scripting si orice vizitator ce foloseste un browser cu javascript activat. Adica 99% dintre utilizatorii de internet.
Asa ca am intrebat in stanga si in dreapta, am cerut ajutorul “baietilor rai” si in final am reusit sa fac rost de ceva interesant.
In urmatorul clip o sa vedeti cate conturi de Yahoo! au fost afectate datorita unor simple si “neinteresante” xss-uri. Unul permanent in hi5.com care permitea introducerea unui iframe in profile iar al doilea aflat intr-un subdomeniu Yahoo!. Totul s-a petrecut in Aprilie 2008 si ce veti vedea in clip sunt rezultatele capatate in 2 saptamani. Cei afectati au fost doar simpli vizitatori hi5 ce navigau pe site in timp ce erau logati pe mail si care au accesat pagina de profil ce continea iframe catre un cookie stealer de Yahoo. Imaginati-va cati ar mai fi fost afectati daca se dadea spam cu profilul respectiv sau daca se implementa un xss worm ce injecta automat acel iframe in toate profilele celor afectati.
Pentru cei care nu inteleg despre ce e vorba, acele date din clip reprezinta conturile de Yahoo la care s-a capatat acces.
Vulnerabilitatea respectiva din hi5 nu mai exista.
P.S. – din acest motiv tot atrag atentia baietilor de la eok.ro sa filtreze javascript. Nu ma ajuta la nimic un serviciu legal de muzica daca intru pe site-ul lor si raman fara conturi, nu-i asa? Promit ca voi fi fair-play iar atunci cand nu voi mai gasi niciun xss in site-ul lor o sa fac un articol in care sa anunt asta.

February 8th, 2009 at 3:46 pm
Touche. Dar eu ma refeream strict la site-ul eok.ro cand am postat acel comentariu. Si mai ales, ma refeream strict la conturile administratorilor de pe eok.ro pentru ca ai mentionat ca pot ramane fara ele daca voi injectati un XSS.
February 8th, 2009 at 3:59 pm
Cucu noi generalizam pe aici de obicei. Probabil ca se poate dar nu am stat sa incerc si cred ca nici baietii nu erau prea incantati daca ma logam ca admin. Au inteles ideea si asta e tot ce conteaza.
February 11th, 2009 at 6:55 am
[...] va intrebati de unde puteau ei sa aiba adresa voastra de mail. E simplu, din retelele sociale. Ei explica un pic cam prea tehnic pentru intelesul public cum se intampla treaba. In schimb procedeul e simplu, iar solutiile [...]
March 21st, 2009 at 4:49 am
Hi5 a avut o gramada de vulnerabilitati, dar ce nu e perfect atrage. E bine ca le-au remediat tot timpul.
June 2nd, 2009 at 1:07 pm
buna
April 21st, 2010 at 1:15 pm
simona u aseara la kapatos ai zis ca vrei sa promovezi manechine asa este eu sunt prima daca vrei iti las email meu selenacosmin@yahoo.com te pup