| Plugin ID | 100 |
| Plugin name | 4D WebStar up to 5.3.3 symbolic link vulnerability |
| Plugin filename | 4D WebStar up to 5.3.3 symbolic link vulnerability.plugin |
| Plugin filesize | 3765 bytes |
| Plugin family | HTTP |
| Plugin created name | Marc Ruef |
| Plugin created email | marc dot ruef at computec dot ch |
| Plugin created web | http://www.computec.ch |
| Plugin created company | computec.ch |
| Plugin created date | 2004/08/16 |
| Plugin updated name | Marc Ruef |
| Plugin updated email | marc dot ruef at computec dot ch |
| Plugin updated web | http://www.computec.ch |
| Plugin updated company | computec.ch |
| Plugin updated date | 2004/11/14 |
| Plugin version | 2.0 |
| Plugin changelog | Deleted a not needed sleep command before the send command in version 1.1. Corrected the plugin structure and added the accuracy values in 1.2. Improved the pattern matching and introduced the plugin changelog in 2.0 |
| Plugin protocol | tcp |
| Plugin port | 80 |
| Plugin procedure detection | open|send GET HTTP/1.0\n\n|sleep|close|pattern_exists HTTP/#.# ### *Server: 4D_WebSTAR* |
| Plugin detection accuracy | 70 |
| Plugin comment | Check is copied from the Nessus plugin (see Nessus ID listed in the sources). |
| Bug published company | @stake inc. |
| Bug published date | 2004/07/13 |
| Bug advisory | http://www.securityfocus.com/archive/1/368778 |
| Bug produced name | 4D |
| Bug produced email | info at 4d dot com |
| Bug produced web | http://www.4d.com |
| Bug affected | 4D WebSTAR 4.0 to 4D WebSTAR 5.3.2 |
| Bug not affected | 4D WebSTAR 5.3.3 and newer |
| Bug vulnerability class | Symlink |
| Bug description | The remote server is running 4D WebStar FTP Server. 4D WebStar is reportedly vulnerable to a local symbolic link vulnerability. This issue is due to a design error that causes the application to open files without properly verifying their existence or their absolute location. Successful exploitation of this issue will allow an attacker to write to arbitrary files writable by the affected application, facilitating privilege escalation. |
| Bug solution | Upgrade to 4D WebStar 5.3.3 or newer. The server should be deactivated or de-installed if not necessary. To make it harder to find the server the daemon could be configured to listen at another port (e.g. 8081). Try to prevent unwanted connection attempts by filtering traffic with firewalling. Alternation of the application banner can confuse an attacker and let him determine the wrong software. |
| Bug fixing time | Approx. 2 hours |
| Bug exploit availability | Yes |
| Bug exploit url | http://www.securityfocus.com/bid/10714/exploit/ |
| Bug remote | Yes |
| Bug local | Yes |
| Bug severity | Low |
| Bug popularity | 3 |
| Bug simplicity | 5 |
| Bug impact | 6 |
| Bug risk | 4 |
| Bug Nessus risk | Low |
| Bug check tools | Nessus |
| Source SecurityFocus BID | 10714 |
| Source Nessus ID | 14241 |
| Source Literature | Hacking Exposed: Network Security Secrets & Solutions, Stuart McClure, Joel Scambray and George Kurtz, February 25, 2003, 4th Edition, McGraw-Hill Osborne Media, ISBN 0072227427 |
| Source Misc. | http://www.computec.ch |