CVE-2020-14382
Published: 3 September 2020
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 * 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.
Notes
Author | Note |
---|---|
debian | Introduced with v2.2.0-rc0 with a7f80a27701450e40ef37e2224577f1a0c98cf0f |
Priority
Status
Package | Release | Status |
---|---|---|
cryptsetup Launchpad, Ubuntu, Debian |
upstream |
Needs triage
|
bionic |
Not vulnerable
(code not present)
|
|
focal |
Released
(2:2.2.2-3ubuntu2.2)
|
|
trusty |
Not vulnerable
(code not present)
|
|
xenial |
Not vulnerable
(code not present)
|
|
Patches: upstream: https://gitlab.com/cryptsetup/cryptsetup/-/commit/52f5cb8cedf22fb3e14c744814ec8af7614146c7 |
Severity score breakdown
Parameter | Value |
---|---|
Base score | 7.8 |
Attack vector | Local |
Attack complexity | Low |
Privileges required | None |
User interaction | Required |
Scope | Unchanged |
Confidentiality | High |
Integrity impact | High |
Availability impact | High |
Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |