CVE-2015-0935: PHP Object Injection in Bomgar Remote Support Portal

Serialization is often used to convert objects into a string representation for communication or to save them for later use. However, deserialization in PHP has certain side-effects, which can be exploited by an attacker who is able to provide the data to be deserialized.

This post will give you an insight on the deserialization of untrusted data vulnerability in the Bomgar Remote Support Portal 14.3.1 (US CERT VU#978652, CVE-2015-0935), which is part of Bomgar's appliance-based remote support software. It covers details on the weakness of Deserializion of Untrusted Data (CWE-502) in PHP applications in general, as well as specific details on the vulnerability and its exploitation in the Bomgar Remote Support Portal 14.3.1.

$@|sh – Or: Getting a shell environment from Runtime.exec

If you happen to have command execution via Java's Runtime.exec on a Unix system, you may already have noticed that it doesn't behave like a normal shell. Although simple commands like ls -al, uname -a, or netstat -ant work fine, more complex commands and especially commands with indispensable features like pipes, redirections, quoting, or expansions do not work at all.

Well, the reason for that is that the command passed to Runtime.exec is not executed by a shell. Instead, if you dig down though the Java source code, you'll end up in the UNIXProcess class, which reveals that calling Runtime.exec results in a fork and exec call on Unix platforms.

Nonetheless, I'll show you a way to still get commands executed in a proper shell.

Exploiting the hidden Saxon XSLT Parser in Ektron CMS

Another vulnerability I came across was in Ektron CMS. It's a .NET-based Web CMS System. If you want to find running instances try "inurl:/workarea filetype:asmx" at Google. The interesting thing about is that Microsoft already reported the initial vulnerability as MSVR12-016 (CVE-2012-5357), but I found a different vector to exploit it.

How I could (i)pass your client security

Half a year ago I stumbled over a software called iPass Open Mobile during a Windows Client security review. iPass Open Mobile helps you in getting network connectivity over Wifi-Hotspots, modem, DSL, etc. It's widely deployed on Windows Clients in large corporations.