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CVE-2021-3520

Published: 30 April 2021

There's a flaw in lz4. An attacker who submits a crafted file to an application linked with lz4 may be able to trigger an integer overflow, leading to calling of memmove() on a negative size argument, causing an out-of-bounds write and/or a crash. The greatest impact of this flaw is to availability, with some potential impact to confidentiality and integrity as well.

Priority

Medium

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package Release Status
lz4
Launchpad, Ubuntu, Debian
impish Not vulnerable
(1.9.3-2)
upstream
Released (1.9.3-2)
xenial
Released (0.0~r131-2ubuntu2+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
bionic
Released (0.0~r131-2ubuntu3.1)
focal
Released (1.9.2-2ubuntu0.20.04.1)
groovy
Released (1.9.2-2ubuntu0.20.10.1)
trusty
Released (0.0~r114-2ubuntu1+esm2)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
jammy Not vulnerable
(1.9.3-2)
hirsute
Released (1.9.3-1ubuntu0.1)
Patches:
upstream: https://github.com/lz4/lz4/commit/8301a21773ef61656225e264f4f06ae14462bca7

Severity score breakdown

Parameter Value
Base score 9.8
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