What is CVE-2018-19791?

CVE-2018-19791 is a vulnerability in LiteSpeed OpenLiteSpeed before 1.5.0 RC6 that allows attackers to amplify response size by requesting the entire response body repeatedly.

How severe is CVE-2018-19791?

The severity of CVE-2018-19791 is rated as medium with a CVSS score of 6.5.

What software versions are affected by CVE-2018-19791?

LiteSpeed OpenLiteSpeed versions up to 1.5.0, including 1.5.0-rc1, 1.5.0-rc2, 1.5.0-rc3, 1.5.0-rc4, and 1.5.0-rc5 are affected by CVE-2018-19791.

How can I mitigate CVE-2018-19791?

To mitigate CVE-2018-19791, users should update LiteSpeed OpenLiteSpeed to version 1.5.0 RC6 or later.

Vulnerability/
CVE-2018-19791

medium

6.5

CWE

3/12/2018

5/8/2024

CVE-2018-19791: Input Validation

First published: Mon Dec 03 2018(Updated: )

The server in LiteSpeed OpenLiteSpeed before 1.5.0 RC6 does not correctly handle requests for byte sequences, allowing an attacker to amplify the response size by requesting the entire response body repeatedly, as demonstrated by an HTTP Range header value beginning with the "bytes=0-,0-" substring.

Credit: cve@mitre.org

Affected Software	Affected Version	How to fix
Litespeedtech Openlitespeed	<1.5.0
Litespeedtech Openlitespeed	=1.5.0
Litespeedtech Openlitespeed	=1.5.0-rc1
Litespeedtech Openlitespeed	=1.5.0-rc2
Litespeedtech Openlitespeed	=1.5.0-rc3
Litespeedtech Openlitespeed	=1.5.0-rc4
Litespeedtech Openlitespeed	=1.5.0-rc5

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Reference Links

https://github.com/litespeedtech/openlitespeed/issues/117

Frequently Asked Questions

What is CVE-2018-19791?
CVE-2018-19791 is a vulnerability in LiteSpeed OpenLiteSpeed before 1.5.0 RC6 that allows attackers to amplify response size by requesting the entire response body repeatedly.
How severe is CVE-2018-19791?
The severity of CVE-2018-19791 is rated as medium with a CVSS score of 6.5.
What software versions are affected by CVE-2018-19791?
LiteSpeed OpenLiteSpeed versions up to 1.5.0, including 1.5.0-rc1, 1.5.0-rc2, 1.5.0-rc3, 1.5.0-rc4, and 1.5.0-rc5 are affected by CVE-2018-19791.
How can I mitigate CVE-2018-19791?
To mitigate CVE-2018-19791, users should update LiteSpeed OpenLiteSpeed to version 1.5.0 RC6 or later.

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vendor/litespeedtech
canonical/litespeedtech openlitespeed
version/litespeedtech openlitespeed/1.5.0
version/litespeedtech openlitespeed/1.5.0-rc1
version/litespeedtech openlitespeed/1.5.0-rc2
version/litespeedtech openlitespeed/1.5.0-rc3
version/litespeedtech openlitespeed/1.5.0-rc4
version/litespeedtech openlitespeed/1.5.0-rc5

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