Executive Summary

Informations
Name CVE-2020-8833 First vendor Publication 2020-04-22
Vendor Cve Last vendor Modification 2020-06-24

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Overall CVSS Score 4.7
Base Score 4.7 Environmental Score 4.7
impact SubScore 3.6 Temporal Score 4.7
Exploitabality Sub Score 1
 
Attack Vector Local Attack Complexity High
Privileges Required Low User Interaction None
Scope Unchanged Confidentiality Impact High
Integrity Impact None Availability Impact None
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:M/Au:N/C:P/I:N/A:N)
Cvss Base Score 1.9 Attack Range Local
Cvss Impact Score 2.9 Attack Complexity Medium
Cvss Expoit Score 3.4 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

Time-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.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8833

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 1
Os 3

Sources (Detail)

Source Url
CONFIRM https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1862933
https://usn.ubuntu.com/4315-1/
UBUNTU https://usn.ubuntu.com/4315-2/

Alert History

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0
1
Date Informations
2020-06-25 05:22:54
  • Multiple Updates
2020-05-23 02:40:57
  • First insertion