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TLS V1.2 Sigalgs Remote Crash (CVE-2015-0291)

發佈者： INTERTOTOALLEN on 2023年6月2日星期五 於 下午1:33


OpenSSL 1.0.2a fix several security issues, one of them let crash TLSv1.2 based services remotelly from internet.


Regarding to the TLSv1.2 RFC,  this version of TLS provides a "signature_algorithms" extension for the client_hello. 

Data Structures
If a bad signature is sent after the renegotiation, the structure will be corrupted, becouse structure pointer:
s->c->shared_sigalgs will be NULL, and the number of algorithms:
s->c->shared_sigalgslen will not be zeroed.
Which will be interpreted as one algorithm to process, but the pointer points to 0x00 address. 


Then tls1_process_sigalgs() will try to process one signature algorithm (becouse of shared_sigalgslen=1) then sigptr will be pointer to c->shared_sigalgs (NULL) and then will try to derreference sigptr->rhash. 


This mean a Segmentation Fault in  tls1_process_sigalgs() function, and called by tls1_set_server_sigalgs() with is called from ssl3_client_hello() as the stack trace shows.




StackTrace

The following code, points sigptr to null and try to read sigptr->rsign, which is assembled as movzbl eax,  byte ptr [0x0+R12] note in register window that R12 is 0x00

Debugger in the crash point.


radare2 static decompiled


The patch fix the vulnerability zeroing the sigalgslen.
Get  David A. Ramos' proof of concept exploit here





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OWASP Announcement

發佈者： INTERTOTOALLEN on 於 上午5:04

🕬  OWASP Announcement:


The OWASP Foundation has been chosen to be 1 of 50 Open Source Organizations to participate in the inaugural year of the Google Season of Docs program.

The goal of Season of Docs is to provide a framework for technical writers and open source projects to work together towards the common goal of improving an open source project's documentation. For technical writers who are new to open source, the program provides an opportunity to gain experience in contributing to open source projects. For technical writers who're already working in open source, the program provides a potentially new way of working together. Season of Docs also gives open source projects an opportunity to engage more of the technical writing community.

We would like to thank the OWASP members that donate their time and knowledge as administrators and mentors. It would not be possible if not for these individuals:
Spyros, Fabio, and Konstantinos 


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How To Hack Facebook By Social Engineering Attack

發佈者： INTERTOTOALLEN on 2023年6月1日星期四 於 下午8:36

This video is specially for educational purpose only. I'm not responsible for your any illegal activity. Thanks!

 Social Engineering Attack

Phishing is the fraudulent attempt to obtain sensitive information such as usernames, passwords, and credit card details (and money), often for malicious reasons, by disguising as a trustworthy entity in an electronic communication. The purpose of this video tutorial is to show you How hackers hacked any thing by Social Engineering Attack.

Phishing is a cybercrime in which a target or targets are contacted by email, telephone or text message by someone posing as a legitimate institution to lure individuals into providing sensitive data such as personally identifiable information, banking and credit card details, and passwords. The information is then used to access important accounts and can result in identity theft and financial loss.

Kali Linux has many tools for doing social engineering attacks. Setoolkit is the most powerful tool in Kali Linux to do a social engineering attacks over the same and different networks. 

Social Engineering over the same network requires the local IP address of your system just like this one 192.168.1.2. Now how you can get your local IP address from your system. To find local IP address just open up your terminal in Linux distribution:

Type: ifconfig wlan0 (if you are using WiFi)
Type: ifconfig eth0 (if you are using eth0)
Type: ifconfig (It display all information about your network)

Now you've another thing to do is that you just have to clone a web page you wanna clone like Facebook, g-mail, twitter etc. Similarly, If you wanna clone a facebook page so for this you just have to type www.facebook.com over your system's terminal for cloning a login page for Social Engineering attack.Still If you don't know how to do that so don't be worry, I did all the process practically in the below just go down and watch it!


How hackers do Social Engineering Attacks. In this video you'll see How to hack Facebook by Phishing attack.Related posts

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