haproxy: malformed HTTP/2 requests can lead to out-of-bounds writes (CVE-2020-11100)

In hpack_dht_insert in hpack-tbl.c in the HPACK decoder in HAProxy 1.8 through 2.x before 2.1.4, a remote attacker can write arbitrary bytes around a certain location on the heap via a crafted HTTP/2 request, possibly causing remote code execution.

References:

• https://nvd.nist.gov/vuln/detail/CVE-2020-11100
• https://security-tracker.debian.org/tracker/CVE-2020-11100

Patch:

https://git.haproxy.org/?p=haproxy-2.1.git;a=patch;h=f17f86304f187b0f10ca6a8d46346afd9851a543

Affected branches:

• master (44acde30)
• 3.11-stable (f190b885)
• 3.10-stable (f0192cc6)
• 3.9-stable (63b8a5e4)
• 3.8-stable