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CVE-2019-3902

Published: 22 April 2019

A flaw was found in Mercurial before 4.9. It was possible to use symlinks and subrepositories to defeat Mercurial's path-checking logic and write files outside a repository.

From the Ubuntu Security Team

It was discovered that Mercurial mishandled symlinks in subrepositories. An attacker could use this vulnerability to write arbitrary files to the target's filesystem.

Priority

Medium

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package Release Status
mercurial
Launchpad, Ubuntu, Debian
impish Not vulnerable
(4.8.2-1ubuntu4)
trusty
Released (2.8.2-1ubuntu1.4+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
bionic
Released (4.5.3-1ubuntu2.2)
hirsute Not vulnerable
(4.8.2-1ubuntu4)
xenial
Released (3.7.3-1ubuntu1.2+esm2)
Available with Ubuntu Pro
cosmic Ignored
(end of life)
disco
Released (4.8.2-1ubuntu3.19.04.1)
eoan Not vulnerable
(4.8.2-1ubuntu4)
focal Not vulnerable
(4.8.2-1ubuntu4)
groovy Not vulnerable
(4.8.2-1ubuntu4)
jammy Not vulnerable
(4.8.2-1ubuntu4)
upstream
Released (4.9-1)

Severity score breakdown

Parameter Value
Base score 5.9
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N