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CVE-2020-28007

Published: 4 May 2021

Exim 4 before 4.94.2 allows Execution with Unnecessary Privileges. Because Exim operates as root in the log directory (owned by a non-root user), a symlink or hard link attack allows overwriting critical root-owned files anywhere on the filesystem.

Priority

Medium

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
exim4
Launchpad, Ubuntu, Debian
upstream Needs triage

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)
impish
Released (4.94-15ubuntu1.2)
jammy
Released (4.94-15ubuntu1.2)
trusty
Released (4.82-3ubuntu2.4+esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
xenial
Released (4.86.2-2ubuntu2.6+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)

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