CVE-2020-15703 aptdaemon allows unprivileged users to test for the presence of local files via the transaction Locale property

2020-09-2400:00:00

CWE-22

canonical

www.cve.org

4 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

3.8 Low

AI Score

Confidence

High

0.0005 Low

EPSS

Percentile

16.0%

JSON

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.

CNA Affected

[
  {
    "product": "aptdaemon",
    "vendor": "Canonical",
    "versions": [
      {
        "lessThan": "1.1.1+bzr982-0ubuntu32.2",
        "status": "affected",
        "version": "unspecified",
        "versionType": "custom"
      },
      {
        "lessThan": "1.1.1+bzr982-0ubuntu19.4",
        "status": "affected",
        "version": "unspecified",
        "versionType": "custom"
      },
      {
        "lessThan": "1.1.1+bzr982-0ubuntu14.4",
        "status": "affected",
        "version": "unspecified",
        "versionType": "custom"
      }
    ]
  }
]