CVE-2020-8831
Last modified
CVE-2020-8831 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. Apport creates a world writable lock file with root ownership in the world writable /var/lock/apport directory. If the apport/ directory does not exist (this is not uncommon as /var/lock is a tmpfs), it will create the directory, otherwise it will simply continue execution using the existing directory. EPSS estimates a 0.66% chance of exploitation in the next 30 days.
Description
Apport creates a world writable lock file with root ownership in the world writable /var/lock/apport directory. If the apport/ directory does not exist (this is not uncommon as /var/lock is a tmpfs), it will create the directory, otherwise it will simply continue execution using the existing directory. This allows for a symlink attack if an attacker were to create a symlink at /var/lock/apport, changing apport's lock file location. This file could then be used to escalate privileges, for example. Fixed in versions 2.20.1-0ubuntu2.23, 2.20.9-0ubuntu7.14, 2.20.11-0ubuntu8.8 and 2.20.11-0ubuntu22.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Canonical | Ubuntu Linux | 14.04 |
| Canonical | Ubuntu Linux | 16.04 |
| Canonical | Ubuntu Linux | 18.04 |
| Canonical | Ubuntu Linux | 19.10 |
| Apport Project | Apport | All versions |
References
- https://launchpad.net/bugs/1862348Exploit, Third Party Advisory
- https://usn.ubuntu.com/4315-1/Third Party Advisory
- https://usn.ubuntu.com/4315-2/Third Party Advisory
- https://launchpad.net/bugs/1862348Exploit, Third Party Advisory
- https://usn.ubuntu.com/4315-1/Third Party Advisory
- https://usn.ubuntu.com/4315-2/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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