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CVE-2020-8833

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CVE-2020-8833

Published: Apr 22, 2020

Modified: Sep 16, 2024

PUBLISHED

CVSS v3.1

5.6

MEDIUM

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.

VendorProductVersions

Canonical

Apport

affected
2.20.1 - < 2.20.1-0ubuntu2.23
affected
2.20.9 - < 2.20.9-0ubuntu7.14
affected
2.20.11 - < 2.20.11-0ubuntu8.8

Weaknesses (CWE)

CWE-367

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

References

USN-4315-2
vendor-advisory
x_refsource_UBUNTU

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