Vulnerability Details : CVE-2020-15703
There is no input validation on the Locale property in an apt transaction. An unprivileged user can supply a full path to a writable directory, which lets aptd read a file as root. Having a symlink in place results in an error message if the file exists, and no error otherwise. This way an unprivileged user can check for the existence of any files on the system as root.
Vulnerability category: Directory traversal
Products affected by CVE-2020-15703
- cpe:2.3:a:aptdaemon_project:aptdaemon:1.1.1:bzr982-0ubuntu14.4:*:*:*:*:*:*
- cpe:2.3:a:aptdaemon_project:aptdaemon:1.1.1:bzr982-0ubuntu19.4:*:*:*:*:*:*
- cpe:2.3:a:aptdaemon_project:aptdaemon:1.1.1:bzr982-0ubuntu32.2:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-15703
0.05%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 13 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-15703
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
2.1
|
LOW | AV:L/AC:L/Au:N/C:P/I:N/A:N |
3.9
|
2.9
|
NIST | |
|
3.3
|
LOW | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
1.8
|
1.4
|
NIST | |
|
4.0
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
2.5
|
1.4
|
Canonical Ltd. |
CWE ids for CVE-2020-15703
-
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.Assigned by:
- nvd@nist.gov (Primary)
- security@ubuntu.com (Secondary)
References for CVE-2020-15703
-
https://www.eyecontrol.nl/blog/the-story-of-3-cves-in-ubuntu-desktop.html
The story of three CVE's in Ubuntu Desktop - EYEExploit;Third Party Advisory
-
https://ubuntu.com/security/notices/USN-4537-1
USN-4537-1: Aptdaemon vulnerability | Ubuntu security notices | UbuntuPatch;Third Party Advisory
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