0cde3cd4df
http_action_set_headers_bin() decodes varint name and value lengths
from a binary sample but never validates that the decoded length
fits in the remaining sample data before constructing the ist.
If the value's varint decodes to a large number with only a few
bytes following, v.len exceeds the buffer and http_add_header()
memcpys past the sample, copying adjacent heap data into a header
sent to the backend (or client, with http-response).
The intended source for this action is the hdrs_bin sample fetch
which produces well-formed output, but nothing prevents an admin
from feeding it req.body or another untrusted source. With:
http-request set-var(txn.h) req.body
http-request add-headers-bin var(txn.h)
a POST body of [05]"X-Foo"[c8]"AB" produces v = {ptr="AB", len=200}
and 198 bytes of adjacent heap data go into X-Foo.
http_action_del_headers_bin() was fixed too.
Compare spoe_decode_buffer() which has the equivalent check.
Validate both name and value lengths against remaining data.
No backport needed.
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| dev | ||
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| scripts | ||
| src | ||
| tests | ||
| .cirrus.yml | ||
| .gitattributes | ||
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| .mailmap | ||
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| BRANCHES | ||
| BSDmakefile | ||
| CHANGELOG | ||
| CONTRIBUTING | ||
| INSTALL | ||
| LICENSE | ||
| MAINTAINERS | ||
| Makefile | ||
| README.md | ||
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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.