Bug 1726542 (CVE-2019-13179) - CVE-2019-13179 calamares: incorrect permission leads to disclosure of decryption keys for LUKS container
Summary: CVE-2019-13179 calamares: incorrect permission leads to disclosure of decrypt...
Alias: CVE-2019-13179
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1726543
TreeView+ depends on / blocked
Reported: 2019-07-03 06:59 UTC by Dhananjay Arunesh
Modified: 2019-09-29 15:15 UTC (History)
4 users (show)

Fixed In Version:
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Last Closed: 2019-07-03 09:08:30 UTC

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Description Dhananjay Arunesh 2019-07-03 06:59:18 UTC
Calamares through 3.2.4 copies a LUKS encryption keyfile from /crypto_keyfile.bin (mode 0600 owned by root) to /boot within a globally readable initramfs image with insecure permissions, which allows this originally protected file to be read by any user, thereby disclosing decryption keys for LUKS containers created with Full Disk Encryption.


Comment 1 Dhananjay Arunesh 2019-07-03 06:59:30 UTC
Created calamares tracking bugs for this issue:

Affects: fedora-all [bug 1726543]

Comment 2 Kevin Kofler 2019-07-03 09:08:30 UTC
This CVE only affects the Debian mkinitramfs (initramfs-tools), which is not used in the Fedora configuration for Calamares. The underlying tool is also not shipped at all by Fedora. Therefore, Fedora is NOT affected by this vulnerability.

Dracut does not require the caller (Calamares in this case) to set the umask, it already does this automatically, and has been doing so since 2012 (since 2016 for one special case). See CVE-2012-4453 (https://github.com/dracutdevs/dracut/commit/e1b48995c26c4f06d1a718539cb1bd5b0179af91) and CVE-2016-8637 (https://github.com/dracutdevs/dracut/commit/0db98910a11c12a454eac4c8e86dc7a7bbc764a4).

Calamares on Fedora IS affected by the related CVE-2019-13178, though.

Comment 3 Kevin Kofler 2019-07-03 11:53:20 UTC
Please note that the upstream version numbers in both CVEs are incorrect, all versions of Calamares up to and including 3.2.10 are affected (but this particular CVE does not affect Fedora, as I explained).

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