[UNIX] BOOZT! Administration CGI Vulnerable to Buffer OverflowFrom: email@example.com
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From: email@example.com To: firstname.lastname@example.org Date: Tue, 8 Jan 2002 21:08:00 +0100 (CET)
The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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BOOZT! Administration CGI Vulnerable to Buffer Overflow
<http://www.boozt.com/> 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.
Here is a reproduction of the bug:
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:
if ((pomus=(char *)GetFromCgi("name"))==NULL) strcpy(name,"");
There is no boundary checking in GetFromCgi:
#define GetFromCgi(name) cgiParam(name)
const char *cgiParam(const char *name)
const char *cgiPosParam(CgiPos *where)
[ ... 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.
The information has been provided by <mailto:email@example.com> Rafael
San Miguel Carrasco.
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