This site is the archived OWASP Foundation Wiki and is no longer accepting Account Requests.
To view the new OWASP Foundation website, please visit https://owasp.org
Difference between revisions of "Direct Static Code Injection"
| Line 1: | Line 1: | ||
{{Template:Attack}} | {{Template:Attack}} | ||
| − | |||
==Description== | ==Description== | ||
| − | |||
Direct Static Code Injection attack consists on injecting code directly onto the resource used by application while processing a user request. This is normally performed by tampering libraries and template files which are created based on user input without proper data sanitization. | Direct Static Code Injection attack consists on injecting code directly onto the resource used by application while processing a user request. This is normally performed by tampering libraries and template files which are created based on user input without proper data sanitization. | ||
Upon a user request to the modified resource, the actions defined on it will be executed at server side in the context of web server process. | Upon a user request to the modified resource, the actions defined on it will be executed at server side in the context of web server process. | ||
| Line 9: | Line 7: | ||
[[Server-Side Includes (SSI) Injection | Server Side Includes]] is considered a type of direct static code injection. It should not be confused with other types of code injection, like [[Cross Site Scripting | XSS]] (“Cross Site Scripting” or “HTML injection”) where the code is executed on client side. | [[Server-Side Includes (SSI) Injection | Server Side Includes]] is considered a type of direct static code injection. It should not be confused with other types of code injection, like [[Cross Site Scripting | XSS]] (“Cross Site Scripting” or “HTML injection”) where the code is executed on client side. | ||
| + | ==Severity== | ||
| + | High | ||
| + | |||
| + | ==Likelihood of exploitation== | ||
| + | Medium to Low | ||
==Examples == | ==Examples == | ||
===Example 1=== | ===Example 1=== | ||
| − | |||
This is a simple example of exploitation of CGISCRIPT.NET csSearch 2.3 vulnerability, published on Bugtraq ID: 4368. | This is a simple example of exploitation of CGISCRIPT.NET csSearch 2.3 vulnerability, published on Bugtraq ID: 4368. | ||
By requesting the following URL to the server, it’s possible to execute commands defined on ‘’’’setup’’’ variable. | By requesting the following URL to the server, it’s possible to execute commands defined on ‘’’’setup’’’ variable. | ||
| Line 23: | Line 25: | ||
Note that the above command must be encoded in order to be accepted. | Note that the above command must be encoded in order to be accepted. | ||
| − | |||
===Example 2=== | ===Example 2=== | ||
| − | |||
This example exploits a vulnerability on Ultimate PHP Board (UPB) 1.9 (CVE-2003-0395), which allows an attacker to execute random php code. This happens because some user variables, like IP address and User-Agent, are stored in a file that is used by admin_iplog.php page to show user statistics. When an administrator browses this page, the previously injected code by a malicious request is executed. | This example exploits a vulnerability on Ultimate PHP Board (UPB) 1.9 (CVE-2003-0395), which allows an attacker to execute random php code. This happens because some user variables, like IP address and User-Agent, are stored in a file that is used by admin_iplog.php page to show user statistics. When an administrator browses this page, the previously injected code by a malicious request is executed. | ||
The following example stores a malicious PHP code that will deface index.html page when administrator browses admin_iplog.php. | The following example stores a malicious PHP code that will deface index.html page when administrator browses admin_iplog.php. | ||
| Line 32: | Line 32: | ||
User-Agent: <? system( "echo \'hacked\' > ../index.html" ); ?> | User-Agent: <? system( "echo \'hacked\' > ../index.html" ); ?> | ||
| − | + | ==External references== | |
| − | == | ||
| − | |||
http://www.seclab.tuwien.ac.at/advisories/TUVSA-0510-001.txt | http://www.seclab.tuwien.ac.at/advisories/TUVSA-0510-001.txt | ||
| − | |||
http://cve.mitre.org/docs/plover/SECTION.9.21.html#CODE.STAT | http://cve.mitre.org/docs/plover/SECTION.9.21.html#CODE.STAT | ||
| − | |||
http://marc.info/?l=bugtraq&m=105379741528925&w=2 | http://marc.info/?l=bugtraq&m=105379741528925&w=2 | ||
| − | |||
http://archives.neohapsis.com/archives/bugtraq/2005-06/0002.html | http://archives.neohapsis.com/archives/bugtraq/2005-06/0002.html | ||
| − | |||
==Related Threats== | ==Related Threats== | ||
| − | |||
| − | |||
[[:Category:Command Execution]] | [[:Category:Command Execution]] | ||
| − | |||
==Related Attacks== | ==Related Attacks== | ||
| − | |||
*[[Server-Side Includes (SSI) Injection | Server Side Includes]] | *[[Server-Side Includes (SSI) Injection | Server Side Includes]] | ||
*[[ Direct Dynamic Code Evaluation ('Eval Injection')]] | *[[ Direct Dynamic Code Evaluation ('Eval Injection')]] | ||
| − | |||
==Related Vulnerabilities== | ==Related Vulnerabilities== | ||
| − | |||
[[:Category:Input Validation Vulnerability]] | [[:Category:Input Validation Vulnerability]] | ||
| Line 64: | Line 52: | ||
[[:Category:Input Validation]] | [[:Category:Input Validation]] | ||
| − | + | [[Category:Injection]] | |
| − | + | [[Category:Attack]] | |
| − | |||
| − | [[ | ||
| − | |||
| − | [[ | ||
| − | |||
| − | |||
Revision as of 16:30, 5 November 2007
- This is an Attack. To view all attacks, please see the Attack Category page.
Description
Direct Static Code Injection attack consists on injecting code directly onto the resource used by application while processing a user request. This is normally performed by tampering libraries and template files which are created based on user input without proper data sanitization. Upon a user request to the modified resource, the actions defined on it will be executed at server side in the context of web server process.
Server Side Includes is considered a type of direct static code injection. It should not be confused with other types of code injection, like XSS (“Cross Site Scripting” or “HTML injection”) where the code is executed on client side.
Severity
High
Likelihood of exploitation
Medium to Low
Examples
Example 1
This is a simple example of exploitation of CGISCRIPT.NET csSearch 2.3 vulnerability, published on Bugtraq ID: 4368.
By requesting the following URL to the server, it’s possible to execute commands defined on ‘’’’setup’’’ variable.
csSearch.cgi?command=savesetup&setup=PERL_CODE_HERE
For the classical example, it can be used the following command to remove all files from “/” folder:
csSearch.cgi?command=savesetup&setup=`rm%20-rf%20/`
Note that the above command must be encoded in order to be accepted.
Example 2
This example exploits a vulnerability on Ultimate PHP Board (UPB) 1.9 (CVE-2003-0395), which allows an attacker to execute random php code. This happens because some user variables, like IP address and User-Agent, are stored in a file that is used by admin_iplog.php page to show user statistics. When an administrator browses this page, the previously injected code by a malicious request is executed. The following example stores a malicious PHP code that will deface index.html page when administrator browses admin_iplog.php.
GET /board/index.php HTTP/1.0 User-Agent: <? system( "echo \'hacked\' > ../index.html" ); ?>
External references
http://www.seclab.tuwien.ac.at/advisories/TUVSA-0510-001.txt http://cve.mitre.org/docs/plover/SECTION.9.21.html#CODE.STAT http://marc.info/?l=bugtraq&m=105379741528925&w=2 http://archives.neohapsis.com/archives/bugtraq/2005-06/0002.html
Related Threats
Related Attacks
Related Vulnerabilities
Category:Input Validation Vulnerability
