CVE-2019-18840

CVSS V2 Medium 5 CVSS V3 High 7.5

Description

In wolfSSL 4.1.0 through 4.2.0c, there are missing sanity checks of memory accesses in parsing ASN.1 certificate data while handshaking. Specifically, there is a one-byte heap-based buffer overflow inside the DecodedCert structure in GetName in wolfcrypt/src/asn.c because the domain name location index is mishandled. Because a pointer is overwritten, there is an invalid free.

Overview

CVE ID
CVE-2019-18840

Assigner
cve@mitre.org

Vulnerability Status
Analyzed

Published Version
2019-11-09T13:15:10

Last Modified Date
2019-11-12T20:57:10

Weakness Enumerations

CWE	URL
CWE-787	http://cwe.mitre.org/data/definitions/787.html

CPE Configuration (Product)

CPE	Vulnerable	Operator	Version Start	Version End
cpe:2.3:a:wolfssl:wolfssl::::::::	1	OR	4.1.0	4.2.0c

CVSS Version 2

Version
2.0

Vector String
AV:N/AC:L/Au:N/C:N/I:N/A:P

Access Vector
NETWORK

Access Compatibility
LOW

Authentication
NONE

Confidentiality Impact
NONE

Integrity Impact
NONE

Availability Impact
PARTIAL

Base Score
5

Severity
MEDIUM

Exploitability Score
10

Impact Score
2.9

CVSS Version 3

Version
3.1

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

Attack Vector
NETWORK

Attack Compatibility
LOW

Privileges Required
NONE

User Interaction
NONE

Scope
UNCHANGED

Confidentiality Impact
NONE

Availability Impact
HIGH

Base Score
7.5

Base Severity
HIGH

Exploitability Score
3.9

Impact Score
3.6

References

Reference URL	Reference Tags
https://github.com/wolfSSL/wolfssl/issues/2555	Exploit Third Party Advisory

Sources

Source Name	Source URL
NIST	https://nvd.nist.gov/vuln/detail/CVE-2019-18840
MITRE	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-18840

History

Created	Old Value	New Value	Data Type	Notes
2022-05-10 16:59:35				Added to TrackCVE
2022-12-04 05:48:23	2019-11-09T13:15Z	2019-11-09T13:15:10	CVE Published Date	updated
2022-12-04 05:48:23		2019-11-12T20:57:10	CVE Modified Date	updated
2022-12-04 05:48:23		Analyzed	Vulnerability Status	updated