Vulnerabilities
Misconfiguration
Runtime Security
Compliance
CVE Vulnerabilities

CVE-2020-25031

Improper Link Resolution Before File Access ('Link Following')

Published: Aug 31, 2020 | Modified: Sep 04, 2020
CVSS 3.x
7.8
HIGH
Source:
NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
7.2 HIGH
AV:L/AC:L/Au:N/C:C/I:C/A:C
RedHat/V2
RedHat/V3
Ubuntu
MEDIUM
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2020-25031
CWEhttps://cwe.mitre.org/data/definitions/59.html

checkinstall 1.6.2, when used to create a package that contains a symlink, may trigger the creation of a mode 0777 executable file.

Weakness

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

Affected Software

Name Vendor Start Version End Version
Checkinstall Canonical 1.6.2 (including) 1.6.2 (including)
Checkinstall Ubuntu bionic *
Checkinstall Ubuntu groovy *
Checkinstall Ubuntu hirsute *
Checkinstall Ubuntu impish *
Checkinstall Ubuntu kinetic *
Checkinstall Ubuntu lunar *
Checkinstall Ubuntu mantic *
Checkinstall Ubuntu trusty *
Checkinstall Ubuntu xenial *

Potential Mitigations

  • Follow the principle of least privilege when assigning access rights to entities in a software system.
  • Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.

References

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