CVE-2015-0254: XXE in Apache Standard Taglibs
Summary
CVE-2015-0254: XXE in Apache Standard Taglibs. Affects org.apache.taglibs:taglibs-standard versions < 1.2.3. Fixed in 1.2.3. How to fix ↓
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Background
Apache Standard Taglibs is a library that provides a set of JSP tag libraries for common tasks such as XML parsing, formatting, and manipulation. It is widely used in Java web applications to simplify the development process. However, versions before 1.2.3 are vulnerable to an XML External Entity (XXE) attack, which can lead to arbitrary code execution or information disclosure.
Vulnerability Detail
The vulnerability in Apache Standard Taglibs allows remote attackers to exploit a crafted XSLT extension in the <x:parse> or <x:transform> JSTL XML tag. By manipulating the XML input, an attacker can execute arbitrary code or conduct XXE attacks. This can result in unauthorized access to sensitive data, server-side request forgery (SSRF), or denial of service (DoS) attacks.
How To Fix
Minimum fixed version
1.2.3
This is the first release that contains the fix.
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Workaround
If upgrading to the latest version is not feasible, a temporary workaround is to disable the usage of the <x:parse> and <x:transform> tags in your application. This can be done by removing or commenting out the corresponding code in your JSP files. However, this workaround may impact the functionality of your application, so upgrading to a patched version is strongly recommended.
Conclusion
The XXE vulnerability in Apache Standard Taglibs can lead to arbitrary code execution or information disclosure. It is crucial to upgrade to version 1.2.3 or later to mitigate this vulnerability. If upgrading is not possible immediately, disabling the <x:parse> and <x:transform> tags can serve as a temporary workaround. For further support on vulnerability remediation, contact DevNack.com.
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FAQ
An XML External Entity (XXE) attack is a type of security vulnerability that allows an attacker to exploit the processing of XML input. By including external entities in the XML, an attacker can read files from the server, perform SSRF attacks, or execute arbitrary code.
You can use Vulert's playground (https://vulert.com/scanner) to check if your application is affected by this vulnerability. Simply provide your pom.xml file, and Vulert will analyze it for open-source vulnerabilities, including this XXE vulnerability in Apache Standard Taglibs.
While specific exploits for this vulnerability may exist, they have not been disclosed publicly at the time of this report. However, it is important to patch your application as soon as possible to prevent potential exploitation.
If upgrading to the latest version is not feasible, you can mitigate this vulnerability by disabling the usage of the <x:parse> and <x:transform> tags in your application. However, this is only a temporary workaround, and upgrading to a patched version is strongly recommended.
At the time of this report, there is no evidence of active attacks exploiting this vulnerability. However, it is important to patch your application to prevent potential exploitation and ensure the security of your system.
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