Release Date: | 2019-10-23 |
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).
See more information about CVE-2019-18277 from MITRE CVE dictionary and NIST NVD
NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.
Base Score: | 7.5 | Base Metrics: | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
Access Vector: | Network | Attack Complexity: | Low |
Privileges Required: | None | User Interaction: | None |
Scope: | Unchanged | Confidentiality Impact: | None |
Integrity Impact: | High | Availability Impact: | None |
Platform | Errata | Release Date |
Oracle Linux version 8 (haproxy) | ELSA-2020-1725 | 2020-05-05 |
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