Out-of-bounds Write Affecting wolfssl/wolfssl package, versions [4.1.0,4.3.0)


Severity

Recommended
0.0
high
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.16% (54th percentile)

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  • Snyk IDSNYK-UNMANAGED-WOLFSSLWOLFSSL-2369440
  • published26 Jan 2022
  • disclosed9 Nov 2019
  • creditUnknown

Introduced: 9 Nov 2019

CVE-2019-18840  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade wolfssl/wolfssl to version 4.3.0 or higher.

Overview

Affected versions of this package are vulnerable to Out-of-bounds Write. 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.

References

CVSS Scores

version 3.1