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[R1] Burp Suite Community Edition Improper Certificate Validation

Medium

Synopsis

While evaluating Burp Community Edition, Tenable discovered that Burp sends a couple of HTTPS requests without verifying the server certificate. Failure to validate the remote certificate allows a man in the middle to intercept communication and inject new data.

Checking For Updates

On start up, Burp sends an HTTPS request to https://[ip]/Burp/Releases/CheckForUpdates?product=community&version=[version] without validating the server certificate. A normal response looks like the following:

{"result":"update_available","licenseId":"","manualDownloadUrl":"/burp/communitydownload/","autoDownloadUrl":"","updates":[{"description":"Various bugfixes and enhancements","builds":[{"installationType":"jar","filename":"burpsuite_community_v1.7.34.jar","fileSize":26400457},{"installationType":"linux","filename":"burpsuite_community_linux_v1_7_34.sh","fileSize":99994421},{"installationType":"macos","filename":"burpsuite_community_macos_v1_7_34.dmg","fileSize":87343864},{"installationType":"win32","filename":"burpsuite_community_windows-x86_v1_7_34.exe","fileSize":90715392},{"installationType":"win64","filename":"burpsuite_community_windows-x64_v1_7_34.exe","fileSize":94483712}],"productType":"community","releaseNotesUrl":"http://releases.portswigger.net/2018/06/1734.html","isStable":true,"version":"1.7.34","eulaContent":"","eulaSerialVersion":""}]}

A man in the middle can alter any of these fields. In particular, we found adding a malicious URL to the description field to be dangerous.

Telemetry Data

Burp fails to validate the server certificate when it sends telemetry data to https://[ip]/feedback/submit. A man in the middle can extract the following client data:

Version: 0
ProductType: Free
ProductVersion: 1.7.32
UniqueIdentifier: [removed]

Type: 4000
Version: 0
DebuggerPresent: false
JavaFX_support: true
file_encoding: Cp1252
java_runtime_name: Java(TM) SE Runtime Environment
java_runtime_version: 1.8.0_112-b15
java_specification_name: Java Platform API Specification
java_specification_vendor: Oracle Corporation
java_specification_version: 1.8
java_vendor: Oracle Corporation
java_version: 1.8.0_112
java_vm_info: mixed mode
java_vm_name: Java HotSpot(TM) 64-Bit Server VM
java_vm_specification_name: Java Virtual Machine Specification
java_vm_specification_vendor: Oracle Corporation
java_vm_specification_version: 1.8
java_vm_vendor: Oracle Corporation
java_vm_version: 25.112-b15
max_memory: 518,979,584
os_arch: amd64
os_name: Windows NT (unknown)
os_version: 10.0
sun_arch_data_model: 64
sun_cpu_endian: little


Type: 5000
Version: 0
FEATURE_TYPE: SUITE_PROCESS_BURP_LAUNCHED
TYPE: FEATURE_USE

Disclosure Timeline

03-05-2018 - Tenable asks [email protected] for a vulnerability disclosure contact.
03-05-2018 - PortSwigger indicates [email protected] can be used for disclosure.
03-05-2018 - Tenable explains man in the middle vulnerabilities due to the lack of certificate validation.
03-06-2018 - PortSwigger indicates this is a non-issue due to code signing.
03-06-2018 - Tenable points out the information disclosure and phishing vectors.
03-07-2018 - PortSwigger indicates they will issue a patch.
04-17-2018 - Tenable asks PortSwigger for status.
04-18-2018 - PortSwigger says not fixed yet.
06-07-2018 - Tenable asks PortSwigger for status.
06-07-2018 - PortSwigger says patch will be released next week.
06-07-2018 - Tenable asks for a specific date.
06-07-2018 - PortSwigger won't commit to a specific date.
06-13-2018 - PortSwigger informs Tenable that the patch has been released.

All information within TRA advisories is provided “as is”, without warranty of any kind, including the implied warranties of merchantability and fitness for a particular purpose, and with no guarantee of completeness, accuracy, or timeliness. Individuals and organizations are responsible for assessing the impact of any actual or potential security vulnerability.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

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