[UNIX] qwik-smtpd Format String Vulnerability
From: SecuriTeam (support_at_securiteam.com)
Date: 11/03/04
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To: list@securiteam.com Date: 3 Nov 2004 17:58:08 +0200
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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qwik-smtpd Format String Vulnerability
------------------------------------------------------------------------
SUMMARY
The <http://qwikmail.sourceforge.net/smtpd/> QwikMail SMTP server
(qwik-smtpd) is "a fast, secure, and efficient mail server (MTA). It is
written in C and many security precautions have been taken to ensure that
the code is safe".
A format string vulnerability exists in the product's logging routine that
allows a remote attacker to cause the product to execute arbitrary code.
DETAILS
Vulnerable Systems:
* qwik-smtpd version 0.3
Vulnerable code:
In the file qwik-smtpd.c the following can be found:
sprintf(Received,"Received: from %s (HELO %s) (%s) by %s with SMTP; %s\n",
clientHost, clientHelo, clientIP, localHost, timebuf);
..
else
{
fprintf(fpout,Received);
..
As you can see, bug found in main() function.
Vendor patch:
A vendor patch is available from:
<http://qwikmail.sourceforge.net/smtpd/qwik-smtpd-0.3.patch>
http://qwikmail.sourceforge.net/smtpd/qwik-smtpd-0.3.patch
--- qwik-smtpd-0.3.orig/qwik-smtpd.c 2002-06-27 22:35:24.000000000
-0700
+++ qwik-smtpd.c 2004-10-30 19:56:14.579287608 -0700
@@ -208,7 +208,7 @@
for(x = 0; x < max_recipients; x++)
{
if(clientRcptTo[x] == NULL) break;
- fprintf(fpout,clientRcptTo[x]);
+ fprintf(fpout,"%s", clientRcptTo[x]);
(void) fflush(fpout);
fprintf(fpout,"\n");
(void) fflush(fpout);
@@ -431,9 +431,9 @@
}
else
{
- fprintf(fpout,Received);
+ fprintf(fpout,"%s", Received);
(void) fflush(fpout);
- fprintf(fpout,messageID);
+ fprintf(fpout,"%s", messageID);
(void) fflush(fpout);
out(354, "type away!");
alarm(data_timeout);
ADDITIONAL INFORMATION
The information has been provided by <mailto:darkeagle@list.ru> Dark
Eagle.
The original article can be found at:
<http://unl0ck.info/advisories/qwik-smtpd.txt>
http://unl0ck.info/advisories/qwik-smtpd.txt
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