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CVE-2020-28013

Published: 4 May 2021

Exim 4 before 4.94.2 allows Heap-based Buffer Overflow because it mishandles "-F '.('" on the command line, and thus may allow privilege escalation from any user to root. This occurs because of the interpretation of negative sizes in strncpy.

Priority

Medium

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
exim4
Launchpad, Ubuntu, Debian
jammy
Released (4.94-15ubuntu1.2)
impish
Released (4.94-15ubuntu1.2)
trusty
Released (4.82-3ubuntu2.4+esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream Needs triage

xenial
Released (4.86.2-2ubuntu2.6+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
bionic
Released (4.90.1-1ubuntu1.8)
focal
Released (4.93-13ubuntu1.5)
groovy
Released (4.94-7ubuntu1.2)
hirsute
Released (4.94-15ubuntu1.2)

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H