Re: wuftpd 2.6.1 -- example of bad coding

[Iván Arce <core.lists.bugtraq () CORE-SDI COM>]

Hello,
 I fail to understand why these vulnerabilities are NOT
 exploitable, could you elaborate a bit on that?
-ivan

----- Original Message -----
From: "Przemyslaw Frasunek" <venglin () FREEBSD LUBLIN PL>
Newsgroups: core.lists.bugtraq
To: <BUGTRAQ () SECURITYFOCUS COM>
Sent: Monday, January 08, 2001 4:12 PM
Subject: wuftpd 2.6.1 -- example of bad coding


> Hello,
>
> There are two non-exploitable format string bugs in wuftpd 2.6.1.
>
> ftpd.c:6272
>
>     if (debug) {
>         char *s = calloc(128 + strlen(remoteident), sizeof(char));
>         if (s) {
>             int i = ntohs(pasv_addr.sin_port);
>             sprintf(s, "PASV port %i assigned to %s", i, remoteident);
> /* here */  syslog(LOG_DEBUG, s);
>             free(s);
>         }
>     }
>
> ftpd.c:6288
>
>     if (debug) {
>         char *s = calloc(128 + strlen(remoteident), sizeof(char));
>         if (s) {
>             sprintf(s, "PASV port assignment assigned for %s",
remoteident);
> /* here */  syslog(LOG_DEBUG, s);
>             free(s);
>         }
>     }
>
> Example:
>
> riget:venglin:~> tail -n1 /etc/hosts
> 212.182.115.2           riget%p%p%p%p%p%p%p%p%p%p.scene.pl riget
> riget:venglin:~> tail -n2 /var/log/debug
> Jan  8 14:28:03 riget ftpd[53990]: command: pasv^M
> Jan  8 14:28:03 riget ftpd[53990]: PASV port 17355 assigned to
riget0xbfbff1640x80536440x807c2000x8066c210x43cb0x80791000xe0x5c0x960x280850
00.scene.pl [212.182.115.2]

---

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Iván Arce
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