CVE-2020-8833

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2020-8833
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-04-22 22:15:00 UTC
Updated2022-10-07 15:14:00 UTC
DescriptionTime-of-check Time-of-use Race Condition vulnerability on crash report ownership change in Apport allows for a possible privilege escalation opportunity. If fs.protected_symlinks is disabled, this can be exploited between the os.open and os.chown calls when the Apport cron script clears out crash files of size 0. A symlink with the same name as the deleted file can then be created upon which chown will be called, changing the file owner to root. Fixed in versions 2.20.1-0ubuntu2.23, 2.20.9-0ubuntu7.14, 2.20.11-0ubuntu8.8 and 2.20.11-0ubuntu22.

Risk And Classification

Problem Types: CWE-367

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Apport Project Apport - All All All
Application Apport Project Apport - All All All
Operating System Canonical Ubuntu Linux 14.04 All All All
Operating System Canonical Ubuntu Linux 16.04 All All All
Operating System Canonical Ubuntu Linux 16.04 All All All
Operating System Canonical Ubuntu Linux 18.04 All All All
Operating System Canonical Ubuntu Linux 19.10 All All All
Operating System Canonical Ubuntu Linux 16.04 All All All
Operating System Canonical Ubuntu Linux 18.04 All All All
Operating System Canonical Ubuntu Linux 19.10 All All All

References

ReferenceSourceLinkTags
USN-4315-2: Apport vulnerabilities | Ubuntu security notices UBUNTU usn.ubuntu.com
USN-4315-1: Apport vulnerabilities | Ubuntu security notices | Ubuntu CONFIRM usn.ubuntu.com Third Party Advisory
Bug #1862933 “Apport crash report & cron script TOCTTOU” : Bugs : apport package : Ubuntu CONFIRM bugs.launchpad.net Exploit, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

LEGACY: Maximilien Bourgeteau

© CVE.report 2026

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report