[R1] Burp Suite Community Edition Improper Certificate Validation
MediumSynopsis
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
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Risk Information
4.8 / 4.0
AV:A/AC:L/Au:N/C:P/I:P/A:N
Burp Community Edition 1.7.32, 1.7.33
Medium