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4D WebSTAR FTP Buffer Overflow.
From: B-r00t <br00t () blueyonder co uk>
Date: Fri, 12 Sep 2003 00:36:22 +0100 (BST)

Hash: SHA1

Remote Vulnerability in 4D WebSTAR Server Suite.

Date:           11.09.2003
Author:         B-r00t. 2003.
Email:          B-r00t <br00t () blueyonder co uk>

Vendor:         4D.
Reference:      http://www.4d.com/products/webstar.html
Versions:       4D WebSTAR 5.3.1 (Latest) => VULNERABLE.
Tested:         4D WebSTAR 5.3.1 (Trial Version).

Exploit:        [attached] 4DWS_ftp.c - Gives a shell on port 6969.

Description:    There is a pre authentication buffer overflow
                that exists in the login mechanism of the WebSTAR
                FTP service. As shown below: -

$ ftp maki
Connected to maki (
220 FTP server ready.
Name (maki:br00t): test
331 User name OK, need password.
530 FTP login failed.
Login failed.
421 Service not available, remote server has closed connection

                The following information is reported in the crash
                logfile '/Users/webstar/Library/Logs/CrashReporter/


Date/Time:  2003-09-08 09:25:24 +0100
OS Version: 10.2.6 (Build 6L60)
Host:       maki

Command:    WSWebServer
PID:        359

Exception:  EXC_BAD_ACCESS (0x0001)
Codes:      KERN_INVALID_ADDRESS (0x0001) at 0x61626364

PPC Thread State:
  srr0: 0x61626364 srr1: 0x4000f030                vrsave: 0x00000000
   xer: 0x00000000   lr: 0x61626364  ctr: 0x90000e40   mq: 0x00000000
    r0: 0x61626364   r1: 0xf02874f0   r2: 0xa0007728   r3: 0xf0288cd0
    r4: 0xf02872e0   r5: 0x0000005e   r6: 0x80808080   r7: 0x00000001
    r8: 0x30000000   r9: 0x00954e64  r10: 0xf02870aa  r11: 0x00959e94
   r12: 0x00000000  r13: 0x00000000  r14: 0x00000000  r15: 0x00000000
   r16: 0x00000000  r17: 0x00000000  r18: 0x00000000  r19: 0x00000000
   r20: 0x00000000  r21: 0x00000000  r22: 0x00000000  r23: 0x0000000b
   r24: 0x00958fec  r25: 0x00958fec  r26: 0x58585858  r27: 0x58585858
   r28: 0x58585858  r29: 0x58585858  r30: 0x58585858  r31: 0x58585858

                As can be seen from the crash dump, the application
                has attempted to execute code at '0x61626364' which
                is ASCII code for 'abcd'. Being able to influence the
                applications execution process means it is possible
                for an attacker to execute arbitrary code and thus
                gain access to the target machine. Fortunately, the
                service is running as the 'webstar' user which is not
                an administrative account by default. However, once an
                attacker has gained initial access to the target machine,
                it is possible to access the system password hashes using
                the 'nidump' utility and hence possibly gain admin (root)
                priveleges if these hashes are cracked.

FIX:            Disable the FTP service until a fix is available.

- -- 

- ----------------------------------------------------
Email : B-r00t <br00t () blueyonder co uk>
Key fingerprint = 74F0 6A06 3E57 083A 4C9B
                  ED33 AD56 9E97 7101 5462
"You Would Be Paranoid If They Were Watching You !!!"
- -----------------------------------------------------

Version: GnuPG v1.2.1 (OpenBSD)


Attachment: 4DWS_ftp.c

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