CVE-2019-18277

published 2019-10-23

CVE-2019-18277: A flaw was found in HAProxy before 2.0.6. In legacy mode, messages featuring a transfer-encoding header missing the "chunked" value were not being correctly…

Priority P3 47 high 7.5 CVSS 3.1

AV N AC L PR N UI N S U C N I H A N

A flaw was found in HAProxy before 2.0.6. In legacy mode, messages featuring a transfer-encoding header missing the "chunked" value were not being correctly rejected. The impact was limited but if combined with the "http-reuse always" setting, it could be used to help construct an HTTP request smuggling attack against a vulnerable component employing a lenient parser that would ignore the content-length header as soon as it saw a transfer-encoding one (even if not entirely valid according to the specification).

Affected

6 ranges

Vendor	Product	Version range	Fixed in
debian	haproxy	< haproxy 2.0.6-1 (bookworm)	haproxy 2.0.6-1 (bookworm)
haproxy	haproxy	< 2.0.6	2.0.6
haproxy	haproxy	>= 0 < 2.0.6-1	2.0.6-1
haproxy	haproxy	>= 0 < 2.0.6-1	2.0.6-1
haproxy	haproxy	>= 0 < 2.0.6-1	2.0.6-1
haproxy	haproxy	>= 0 < 2.0.6-1	2.0.6-1

CVSS provenance

nvd v3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

nvd v2.0 4.3 MEDIUM AV:N/AC:M/Au:N/C:N/I:P/A:N

osv 7.5 HIGH

vendor_debian 7.5 HIGH

vendor_redhat 7.5 HIGH

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