CVE-2019-18277

Advisory lineage Upstream: 0 Downstream: 14
Modified
Published: 23 Oct 2019, 13:07
Last modified:05 Aug 2024, 01:47

Vulnerability Summary

Overall Risk (default)
medium
41/100
CVSS Score
7.5 HIGH
v3.1 (nvd)
EPSS Score
2.82% LOW
3% probability +1.85%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

23 Oct 2019, 13:07
Published
Vulnerability first disclosed
05 Aug 2024, 01:47
Last Modified
Vulnerability information updated

Description

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).

CVSS Metrics

  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
  • v2.0•MEDIUM•Score: 4.3AV:N/AC:M/Au:N/C:N/I:P/A:N

EPSS Trends

Current EPSS score: 2.82%• Percentile: 86%

Techniques & Countermeasures

  • CWE-444•Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

    The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

Affected Systems

  • haproxy•haproxy

    < 2.0.6

References (7)