CVE-2020-14382 Information

Description

A vulnerability was found in upstream release cryptsetup-2.2.0 where there’s a bug in LUKS2 format validation code that is effectively invoked on every device/image presenting itself as LUKS2 container. The bug is in segments validation code in file ’lib/luks2/luks2_json_metadata.c’ in function hdr_validate_segments(struct crypt_device *cd json_object *hdr_jobj) where the code does not check for possible overflow on memory allocation used for intervals array (see statement \intervals = malloc(first_backup LICENSE README.md cvefilelist cvelist nvdcve nvdpages.sh scripts test-CVE-2017-1882.markdown test-CVE-2017-18822.markdown tmpvendorlinks sizeof(*intervals));). Due to the bug library can be tricked to expect such allocation was successful but for far less memory then originally expected. Later it may read data FROM image crafted by an attacker and actually write such data BEYOND allocated memory.

CVSS Vector

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

Reference

https://bugzilla.redhat.com/show_bug.cgi?id=1874712 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OJTQ4KSVCW2NMSU5WFVPOHY46WMNF4OB/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TD6YSD63LLRRC4WQ7DJLSXWNUCY6FWBM/ https://usn.ubuntu.com/4493-1/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8