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CVE-2020-8833

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-4315-2
Posted Jun 15, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4315-2 - USN-4315-1 fixed several vulnerabilities in Apport. This update provides the corresponding update for Ubuntu 14.04 ESM. Maximilien Bourgeteau discovered that the Apport lock file was created with insecure permissions. This could allow a local attacker to escalate their privileges via a symlink attack. Various other issues were also addressed.

tags | advisory, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2020-8831, CVE-2020-8833
SHA-256 | 7347091baf4ebd4bd549c2657d8611e56b9e6996a1c7a1589d41ade876fdb78b
Ubuntu Security Notice USN-4315-1
Posted Apr 2, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4315-1 - Maximilien Bourgeteau discovered that the Apport lock file was created with insecure permissions. This could allow a local attacker to escalate their privileges via a symlink attack. Maximilien Bourgeteau discovered a race condition in Apport when setting crash report permissions. This could allow a local attacker to read arbitrary files via a symlink attack.

tags | advisory, arbitrary, local
systems | linux, ubuntu
advisories | CVE-2020-8831, CVE-2020-8833
SHA-256 | d819c4efafca8506e3f245fcae9dc7047781ae3500f6f819a3a3741e775ed104
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