SecuriTeam - BOOZT! Administration CGI Vulnerable to Buffer Overflow

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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

BOOZT! is a banner management software for Linux servers. A security vulnerability in the product allows remote attackers to execute arbitrary code, by exploiting a buffer overflow vulnerability in the CGI.

Credit:
The information has been provided by Rafael San Miguel Carrasco.

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Example:
Here is a reproduction of the bug:
http://127.0.0.1:8080/cgi-bin/boozt/admin/index.cgi?section=5&input=1

Fill the "Name Field" with enough A's (over 770 A's) and press "Create New Banner". You should see the following:

Internal Server Error

The server encountered an internal error or mis-configuration and was unable to complete your request.

Let us see what happened in error_log:

[Tue Feb 5 17:13:52 2002] [error] [client 127.0.0.1] Premature end of script headers: /usr/local/apache/cgi-bin/boozt/admin/index.cgi

Now see what the code for the AdministrationBanners function (src/admin/banners.c) looks like:

         char name[255]="";

         [...]

        if ((pomus=(char *)GetFromCgi("name"))==NULL) strcpy(name,"");
        else strcpy(name,pomus);

There is no boundary checking in GetFromCgi:

        #define GetFromCgi(name) cgiParam(name)

        const char *cgiParam(const char *name)
        {
         return cgiPosParam((CgiPos*)listGetByName(name));
        }

        const char *cgiPosParam(CgiPos *where)
        {
         CgiElement *w=(CgiElement*)where;
         DefCheck(NULL);

         [ ... code to walk over the linked list ... ]
        }

This way we can write custom shellcode beyond the boundaries of the "name" variable, getting a shell with HTTPd privileges.

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