CVE-2020-8833
CVSS V2 Low 1.9
CVSS V3 Medium 4.7
Description
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.
Overview
- CVE ID
- CVE-2020-8833
- Assigner
- security@ubuntu.com
- Vulnerability Status
- Analyzed
- Published Version
- 2020-04-22T22:15:12
- Last Modified Date
- 2022-10-07T15:14:27
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:* | 1 | OR | ||
| cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* | 1 | OR | ||
| cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* | 1 | OR | ||
| cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:a:apport_project:apport:-:*:*:*:*:*:*:* | 1 | OR |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:L/AC:M/Au:N/C:P/I:N/A:N
- Access Vector
- LOCAL
- Access Compatibility
- MEDIUM
- Authentication
- NONE
- Confidentiality Impact
- PARTIAL
- Integrity Impact
- NONE
- Availability Impact
- NONE
- Base Score
- 1.9
- Severity
- LOW
- Exploitability Score
- 3.4
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
- Attack Vector
- LOCAL
- Attack Compatibility
- HIGH
- Privileges Required
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- HIGH
- Availability Impact
- NONE
- Base Score
- 4.7
- Base Severity
- MEDIUM
- Exploitability Score
- 1
- Impact Score
- 3.6
References
| Reference URL | Reference Tags |
|---|---|
| https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1862933 | Exploit Third Party Advisory |
| https://usn.ubuntu.com/4315-1/ | Third Party Advisory |
| https://usn.ubuntu.com/4315-2/ |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2020-8833 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8833 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 16:42:03 | Added to TrackCVE | |||
| 2022-12-04 15:30:51 | 2020-04-22T22:15Z | 2020-04-22T22:15:12 | CVE Published Date | updated |
| 2022-12-04 15:30:51 | 2022-10-07T15:14:27 | CVE Modified Date | updated | |
| 2022-12-04 15:30:51 | Analyzed | Vulnerability Status | updated |