bd03f05007
decode_varint() has no iteration cap and accepts varints decoding to any uint64_t value. When sz is large enough that p + sz wraps modulo 2^64, the check "p + sz > end" passes, *buf is set to the wrapped pointer, and the caller's parsing loop continues from an arbitrary relative offset before the demux buffer. A malicious SPOE agent sending an AGENT_HELLO frame with a key-name length varint of 0xfffffffffffff000 causes spop_conn_handle_hello() to dereference memory ~64KB before the dbuf allocation, resulting in SIGSEGV (DoS) or, if the read lands on live heap data, parser confusion. The relative offset is fully attacker-controlled and ASLR-independent. Compare against the remaining length instead of computing p + sz. Since p <= end is guaranteed after a successful decode_varint(), end - p is non-negative. This patch must be backport to all stable versions.
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.