Vulnerability identifier: #VU23408

Vulnerability risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-13178

CWE-ID: CWE-362

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Calamares
Client/Desktop applications / Software for system administration

Vendor: Calamares

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Calamares: 3.1 - 3.2.10

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External links
http://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1835095
http://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1835096
http://bugzilla.redhat.com/show_bug.cgi?id=1726565
http://calamares.io/calamares-3.2.11-is-out/
http://calamares.io/calamares-cve-2019/
http://github.com/calamares/calamares/issues/1190
http://github.com/calamares/calamares/issues/1191
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Q57BOTBA2J5U4GVKUP7N2PD5H7B3BVUU/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/R2ZDQRGBGRVRW5LPJWKUNS3M66LZ3KYC/
http://www.pavelkogan.com/2014/05/23/luks-full-disk-encryption/
http://www.pavelkogan.com/2015/01/25/linux-mint-encryption/

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.