Race condition in Calamares - CVE-2019-13178
Published: December 5, 2019
Vulnerability identifier: #VU23408
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2019-13178
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Calamares
Affected software:
Calamares
Calamares
Detailed vulnerability description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a race condition in modules/luksbootkeyfile/main.py when creating LUKS encryption keyfile. A local user can exploit the race and gain unauthorized access to sensitive information in the encryption file while the application sets permissions on the file.
How to mitigate CVE-2019-13178
Install updates from vendor's website.
Sources
- https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1835095
- https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1835096
- https://bugzilla.redhat.com/show_bug.cgi?id=1726565
- https://calamares.io/calamares-3.2.11-is-out/
- https://calamares.io/calamares-cve-2019/
- https://github.com/calamares/calamares/issues/1190
- https://github.com/calamares/calamares/issues/1191
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Q57BOTBA2J5U4GVKUP7N2PD5H7B3BVUU/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/R2ZDQRGBGRVRW5LPJWKUNS3M66LZ3KYC/
- https://www.pavelkogan.com/2014/05/23/luks-full-disk-encryption/
- https://www.pavelkogan.com/2015/01/25/linux-mint-encryption/