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CVE-2020-15703

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

LOW
3.3
CVSS Score
Published: October 31, 2020 at 03:45 AM UTC
Updated: June 17, 2026 at 02:57 AM UTC
2 products affected across 2 vendorsAptdaemonUbuntu Linux

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Severity
LOW3.3
Exploit prediction
EPSS 0.5%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Aptdaemon· Aptdaemon Project
95%
1.1.1 bzr982-0ubuntu14.41.1.1 bzr982-0ubuntu19.41.1.1 bzr982-0ubuntu32.2
Ubuntu Linux· Canonicalrubygems
60%
v < 1.1.1+bzr982-0ubuntu14.4v < 1.1.1+bzr982-0ubuntu19.4v < 1.1.1+bzr982-0ubuntu32.2
Affected range stops below 1.1.1+bzr982-0ubuntu14.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.1.1+bzr982-0ubuntu19.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.1.1+bzr982-0ubuntu32.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://ubuntu.com/security/notices/USN-4537-1
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://www.eyecontrol.nl/blog/the-story-of-3-cves-in-ubuntu-desktop.html

CVSS

3.3LOW[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-22

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