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

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

Continue reading

• Pentest Tools Website Vulnerability
• Pentest Tools Github
• Hack Tools For Windows
• Hacking Tools For Windows 7
• Hacker Tool Kit
• Hack Tools For Pc
• Hacker Tools Hardware
• Pentest Tools Online
• Hacking Tools Windows
• Pentest Tools Apk
• Hacker Tool Kit
• How To Hack
• How To Hack
• Pentest Tools Website
• Hacker Tools Mac
• Nsa Hack Tools
• Hacker Tools Software