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[email protected]CVE-2020-14382

HistorySep 16, 2020 - 3:15 p.m.

CVE-2020-14382

2020-09-1615:15:12

CWE-787

[email protected]

web.nvd.nist.gov

135

vulnerability

cryptsetup-2.2.0

memory overflow

luks2

nvd

CVSS2

6.8

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

AI Score

7.4

Confidence

High

EPSS

0.001

Percentile

43.5%

JSON

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.

Affected configurations

Vulners

NVD

Node

cryptsetup_projectcryptsetupRange≤2.2.0

VendorProductVersionCPE
cryptsetup_projectcryptsetup*cpe:2.3:a:cryptsetup_project:cryptsetup:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
cryptsetup_project	cryptsetup	*	cpe:2.3:a:cryptsetup_project:cryptsetup::::::::

CNA Affected

[
  {
    "product": "cryptsetup",
    "vendor": "n/a",
    "versions": [
      {
        "status": "affected",
        "version": "cryptsetup-2.2.0"
      }
    ]
  }
]