CVE-2021-44790

Publication date 20 December 2021

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

A carefully crafted request body can cause a buffer overflow in the mod_lua multipart parser (r:parsebody() called from Lua scripts). The Apache httpd team is not aware of an exploit for the vulnerabilty though it might be possible to craft one. This issue affects Apache HTTP Server 2.4.51 and earlier.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
apache2	22.04 LTS jammy	Fixed 2.4.52-1ubuntu1
	21.10 impish	Fixed 2.4.48-3.1ubuntu3.2
	21.04 hirsute	Fixed 2.4.46-4ubuntu1.5
	20.04 LTS focal	Fixed 2.4.41-4ubuntu3.9
	18.04 LTS bionic	Fixed 2.4.29-1ubuntu4.21
	16.04 LTS xenial	Fixed 2.4.18-2ubuntu3.17+esm4 Ubuntu Pro
	14.04 LTS trusty	Fixed 2.4.7-1ubuntu4.22+esm3 Ubuntu Pro

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Notes

mdeslaur

Fixed by r1896039 in 2.4.x

sbeattie

mod_lua is not runtime enabled with Apache's package config in Ubuntu by default.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
apache2	Upstream: https://svn.apache.org/viewvc?view=revision&revision=1896039 Upstream: 07b9768

Severity score breakdown

Parameter	Value
Base score	9.8 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H