CVE-2020-27304

The CivetWeb web library does not validate uploaded filepaths when running on an OS other than Windows, when using the built-in HTTP form-based file upload mechanism, via the mg_handle_form_request API. Web applications that use the file upload form handler, and use parts of the user-controlled filename in the output path, are susceptible to directory traversal

The CivetWeb web library does not validate uploaded filepaths when running on an OS other than Windows, when using the built-in HTTP form-based file upload mechanism, via the mg_handle_form_request API. Web applications that use the file upload form handler, and use parts of the user-controlled filename in the output path, are susceptible to directory traversal

The CivetWeb web library does not validate uploaded filepaths when running on an OS other than Windows, when using the built-in HTTP form-based file upload mechanism, via the mg_handle_form_request API. Web applications that use the file upload form handler, and use parts of the user-controlled filename in the output path, are susceptible to directory traversal

The CivetWeb web library does not validate uploaded filepaths when running on an OS other than Windows, when using the built-in HTTP form-based file upload mechanism, via the mg_handle_form_request API. Web applications that use the file upload form handler, and use parts of the user-controlled filename in the output path, are susceptible to directory traversal

The CivetWeb web library does not validate uploaded filepaths when running on an OS other than Windows, when using the built-in HTTP form-based file upload mechanism, via the mg_handle_form_request API. Web applications that use the file upload form handler, and use parts of the user-controlled filename in the output path, are susceptible to directory traversal

The CivetWeb web library does not validate uploaded filepaths when running on an OS other than Windows, when using the built-in HTTP form-based file upload mechanism, via the mg_handle_form_request API. Web applications that use the file upload form handler, and use parts of the user-controlled filename in the output path, are susceptible to directory traversal

The CivetWeb web library does not validate uploaded filepaths when running on an OS other than Windows, when using the built-in HTTP form-based file upload mechanism, via the mg_handle_form_request API. Web applications that use the file upload form handler, and use parts of the user-controlled filename in the output path, are susceptible to directory traversal

The CivetWeb web library does not validate uploaded filepaths when running on an OS other than Windows, when using the built-in HTTP form-based file upload mechanism, via the mg_handle_form_request API. Web applications that use the file upload form handler, and use parts of the user-controlled filename in the output path, are susceptible to directory traversal

This update for civetweb fixes the following issues:

Version 1.15:

• boo#1191938 / CVE-2020-27304: missing uploaded filepath validation in the default form-based file upload mechanism
• New configuration for URL decoding
• Sanitize filenames in handle form
• Example “embedded_c.c”: Do not overwrite files (possible security issue)
• Remove obsolete examples
• Remove “experimental” label for some features
• Remove MG_LEGACY_INTERFACE that have been declared obsolete in 2017 or earlier
• Modifications to build scripts, required due to changes in the test environment
• Unix domain socket support fixed
• Fixes for NO_SSL_DL
• Fixes for some warnings / static code analysis

Version 1.14:

• Change SSL default setting to use TLS 1.2 as minimum (set config if you need an earlier version)
• Add local_uri_raw field (not sanitized URI) to request_info
• Additional API functions and a callback after closing connections
• Allow mbedTLS as OpenSSL alternative (basic functionality)
• Add OpenSSL 3.0 support (OpenSSL 3.0 Alpha 13)
• Support UNIX/Linux domain sockets
• Fuzz tests and ossfuzz integration
• Compression for websockets
• Restructure some source files
• Improve documentation
• Fix HTTP range requests
• Add some functions for Lua scripts/LSP
• Build system specific fixes (CMake, MinGW)
• Update 3rd party components (Lua, lfs, sqlite)
• Allow Lua background script to use timers, format and filter logs
• Remove WinCE code
• Update version number

Version 1.13:

• Add arguments for CGI interpreters
• Support multiple CGi interpreters
• Buffering HTTP response headers, including API functions mg_response_header_* in C and Lua
• Additional C API functions
• Fix some memory leaks
• Extended use of atomic operations (e.g., for server stats)
• Add fuzz tests
• Set OpenSSL 1.1 API as default (from 1.0)
• Add Lua 5.4 support and deprecate Lua 5.1
• Provide additional Lua API functions
• Fix Lua websocket memory leak when closing the server
• Remove obsolete 'file in memory' implementation
• Improvements and fixes in documentation
• Fixes from static source code analysis
• Additional unit tests
• Various small bug fixes
• Experimental support for some HTTP2 features (not ready for production)
• Experimental support for websocket compression
• Remove legacy interfaces declared obsolete since more than 3 years

Version 1.12

• See https://github.com/civetweb/civetweb/releases/tag/v1.12 for detailed changelog