bugtraq - Re: PST Linux Advisor--------Dsh-0.24.0 in debian has a home env Buffer Overflow Vulnerability

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Message-ID: <20030814190519.19809.qmail@www.securityfocus.com>
Date: 14 Aug 2003 19:05:19 -0000
From: Vade 79 <v9@...ehalo.deadpig.org>
To: bugtraq@...urityfocus.com
Subject: Re: PST Linux Advisor--------Dsh-0.24.0 in debian has a home env
    Buffer Overflow Vulnerability


In-Reply-To: <20030810011227.5888.qmail@....securityfocus.com>

>  ssize_t buflen = 50 * strlen(fmt); /* pick a number, any number 
>*/.............lol
>  *strp = malloc(buflen);
>
>  if (*strp)
>  {
>    va_list ap;
>    va_start(ap, fmt);
>    vsnprintf(*strp, buflen, fmt, 
ap);..................................lol

>getenv("HOME") >50*strlen(%s/.dsh/dsh.conf)  ......buf overflow......

how do you figure? it uses the same buflen value to limit the amount 
written to the buffer in the vsnprintf call as it was allocated(cept 
didn't add space for the null byte)? am i missing something?