Out-of-bounds Write Affecting integritysetup package, versions <0:2.3.3-2.el8


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.11% (45th percentile)

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  • Snyk IDSNYK-RHEL8-INTEGRITYSETUP-3829880
  • published26 Jul 2021
  • disclosed3 Sept 2020

Introduced: 3 Sep 2020

CVE-2020-14382  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade RHEL:8 integritysetup to version 0:2.3.3-2.el8 or higher.
This issue was patched in RHSA-2020:4542.

NVD Description

Note: Versions mentioned in the description apply only to the upstream integritysetup package and not the integritysetup package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

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.

CVSS Scores

version 3.1