4db85fc53e
acme_res_certificate() passes the httpclient response buffer to ssl_sock_load_pem_into_ckch(), which will then call BIO_new_mem_buf(buf, -1). The "-1" flag will make the OpenSSL PEM parser determine the length by using strlen(). However, the httpclient populates the response buffer with __b_putblk() without writing a trailing NUL to it. The byte at area[data] is whatever data previously resided there in the memory pool. Thus, a malicious or compromised ACME CA can perform an arbitrary-length out-of-bounds read until hitting the first NULL byte past the response body. The OpenSSL PEM loader will try to iterate to load the chain certificates, thus the PEM-looking garbage found in freed memory chunks can be erroneously loaded as additional intermediate certificates. The presence of a single NUL inside the valid response body will result in silent truncation of the certificate. Make sure that the area[data] contains a terminating NULL before passing the buffer to the parser. Fail on insufficient room for the NUL terminator. No backport required: The ACME client has been added in 3.x and this code path didn't exist in 2.x. |
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HAProxy
HAProxy is a free, very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.
Installation
The INSTALL file describes how to build HAProxy. A list of packages is also available on the wiki.
Getting help
The discourse and the mailing-list are available for questions or configuration assistance. You can also use the slack or IRC channel. Please don't use the issue tracker for these.
The issue tracker is only for bug reports or feature requests.
Documentation
The HAProxy documentation has been split into a number of different files for ease of use. It is available in text format as well as HTML. The wiki is also meant to replace the old architecture guide.
Please refer to the following files depending on what you're looking for:
- INSTALL for instructions on how to build and install HAProxy
- BRANCHES to understand the project's life cycle and what version to use
- LICENSE for the project's license
- CONTRIBUTING for the process to follow to submit contributions
The more detailed documentation is located into the doc/ directory:
- doc/intro.txt for a quick introduction on HAProxy
- doc/configuration.txt for the configuration's reference manual
- doc/lua.txt for the Lua's reference manual
- doc/SPOE.txt for how to use the SPOE engine
- doc/network-namespaces.txt for how to use network namespaces under Linux
- doc/management.txt for the management guide
- doc/regression-testing.txt for how to use the regression testing suite
- doc/peers.txt for the peers protocol reference
- doc/coding-style.txt for how to adopt HAProxy's coding style
- doc/internals for developer-specific documentation (not all up to date)
License
HAProxy is licensed under GPL 2 or any later version, the headers under LGPL 2.1. See the LICENSE file for a more detailed explanation.