HAProxy 1.9.15 was released on 2020/04/02. It added 53 new commits
after version 1.9.14.

The main driver for this release is that it contains a fix for a serious
vulnerability that was responsibly reported last week by Felix Wilhelm
from Google Project Zero, affecting the HPACK decoder used for HTTP/2.
CVE-2020-11100 was assigned to this issue.

In 1.9, it is possible to work around this issue by removing "npn h2",
"alpn h2" or "proto h2" on "bind" lines, which will result in disabling
HTTP/2 support.. But upgrading will be way easier and safer!

This vulnerability makes it possible under certain circumstances to write
to a wide range of memory locations within the process' heap, with the
limitation that the attacker doesn't control the absolute address, so the
most likely result and by a far margin will be a process crash, but it is
not possible to completely rule out the faint possibility of a remote code
execution, at least in a lab-controlled environment. Felix was kind enough
to agree to delay the publication of his findings to the 20th of this month
in order to leave enough time to haproxy users to apply updates. But please
do not wait, as it is not very difficult to figure how to exploit the bug
based on the fix. Distros were notified and will also have fixes available
very shortly.

Three other important fixes are present in this version:
  - a non-portable way of calculating a list pointer that breaks with
    gcc 10 unless using -fno-tree-pta. This bug results in infinite loops
    at random places in the code depending how the compiler decides to
    optimize the code.

  - a bug in the way TLV fields are extracted from the PROXY protocol, as
    they could be mistakenly looked up in the subsequent payload, even
    though these would have limited effects since these ones would generally
    be meaningless for the transported protocol, but could be used to hide a
    source address from logging for example.

  - the "tarpit" rules were partially broken in that since 1.9 they wouldn't
    prevent a connection from being sent to a server while the 500 response
    is delivered to the client. Given that they are often used to block
    suspicious activity it's problematic.

The rest is less important, but still relevant to some users. Please have a
look at the changelog below for a more detailed list of fixes, and do not
forget to update, either from the sources or from your regular distro channels.

Important note: let me remind that we're almost 18 months after 1.9 was
released, that in December we said it would live for another 3-4 months,
and that now it's about time to see it disappear. Thus barring any other
major issue requiring a quick fix in the forthcoming weeks/months, it's
unlikely that there will be another 1.9 version. I'm not suggesting to
rush an upgrade especially when dealing with a security issue, but keep
somewhere in your head that you'll really need to migrate to 2.0 or newer
soon. I'll purposely mark it "End of life" on the site, even though I'm
still open to a few extras if really needed and justified.

Please find the usual URLs below :
   Site index       : http://www.haproxy.org/
   Discourse        : http://discourse.haproxy.org/
   Slack channel    : https://slack.haproxy.org/
   Issue tracker    : https://github.com/haproxy/haproxy/issues
   Sources          : http://www.haproxy.org/download/1.9/src/
   Git repository   : http://git.haproxy.org/git/haproxy-1.9.git/
   Git Web browsing : http://git.haproxy.org/?p=haproxy-1.9.git
   Changelog        : http://www.haproxy.org/download/1.9/src/CHANGELOG
   Cyril's HTML doc : http://cbonte.github.io/haproxy-dconv/

Complete changelog :
Bjoern Jacke (1):
      DOC: fix typo about no-tls-tickets

Björn Jacke (1):
      DOC: improve description of no-tls-tickets

Christopher Faulet (16):
      MINOR: http-htx: Add a function to retrieve the headers size of an HTX 
      MINOR: filters: Forward data only if the last filter forwards something
      BUG/MINOR: filters: Count HTTP headers as filtered data but don't forward 
      BUG/MINOR: http-ana: Matching on monitor-uri should be case-sensitive
      BUG/MAJOR: http-ana: Always abort the request when a tarpit is triggered
      BUG/MINOR: http-ana: Reset request analysers on a response side error
      BUG/MINOR: lua: Ignore the reserve to know if a channel is full or not
      BUG/MINOR: http-rules: Preserve FLT_END analyzers on reject action
      BUG/MINOR: http-rules: Fix a typo in the reject action function
      BUG/MINOR: rules: Preserve FLT_END analyzers on silent-drop action
      BUG/MINOR: rules: Increment be_counters if backend is assigned for a 
      MINOR: http-rules: Add a flag on redirect rules to know the rule direction
      MINOR: http-rules: Handle the rule direction when a redirect is evaluated
      BUG/MINOR: filters: Use filter offset to decude the amount of forwarded 
      BUG/MINOR: filters: Forward everything if no data filters are called
      BUG/MINOR: http-ana: Reset request analysers on error when waiting for 

Daniel Corbett (1):
      BUG/MINOR: stats: Fix color of draining servers on stats page

Ilya Shipitsin (1):
      DOC: assorted typo fixes in the documentation

Jerome Magnin (1):
      BUG/MINOR: http_ana: make sure redirect flags don't have overlapping bits

Lukas Tribus (2):
      BUG/MINOR: dns: ignore trailing dot
      DOC: ssl: clarify security implications of TLS tickets

Miroslav Zagorac (1):
      DOC: internals: Fix spelling errors in filters.txt

Olivier Houchard (1):
      BUG/MINOR: connections: Make sure we free the connection on failure.

Tim Duesterhus (3):
      BUG/MINOR: sample: Make sure to return stable IDs in the unique-id fetch
      BUG/MAJOR: proxy_protocol: Properly validate TLV lengths
      DOC: proxy_protocol: Reserve TLV type 0x05 as PP2_TYPE_UNIQUE_ID

William Dauchy (1):
      BUG/MINOR: namespace: avoid closing fd when socket failed in my_socketat

William Lallemand (2):
      BUG/MINOR: peers: init bind_proc to 1 if it wasn't initialized
      BUG/MINOR: peers: avoid an infinite loop with peers_fe is NULL

Willy Tarreau (22):
      SCRIPTS: announce-release: use mutt -H instead of -i to include the draft
      BUILD: cfgparse: silence a bogus gcc warning on 32-bit machines
      CONTRIB: debug: add the possibility to decode the value as certain types 
      CONTRIB: debug: support reporting multiple values at once
      CONTRIB: debug: also support reading values from stdin
      BUG/MEDIUM: shctx: make sure to keep all blocks aligned
      MINOR: compiler: move CPU capabilities definition from config.h and 
complete them
      BUG/MEDIUM: ebtree: don't set attribute packed without unaligned access 
      BUILD: fix recent build failure on unaligned archs
      MINOR: compiler: add new alignment macros
      BUILD: ebtree: improve architecture-specific alignment
      BUG/MINOR: sample: fix the json converter's endian-sensitivity
      BUG/MEDIUM: ssl: fix several bad pointer aliases in a few sample fetch 
      BUG/MINOR: connection: make sure to correctly tag local PROXY connections
      BUG/MAJOR: list: fix invalid element address calculation
      DOC: fix incorrect indentation of http_auth_*
      REGTEST: make the PROXY TLV validation depend on version 2.2
      BUG/MINOR: haproxy: always initialize sleeping_thread_mask
      REGTESTS: use "command -v" instead of "which"
      REGTEST: increase timeouts on the seamless-reload test
      BUG/MEDIUM: http: unbreak redirects in legacy mode
      BUG/CRITICAL: hpack: never index a header into the headroom after wrapping


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