Out-of-bounds Write Affecting wolfssl package, versions <4.2.0+dfsg-3
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Test your applications- Snyk ID SNYK-DEBIANUNSTABLE-WOLFSSL-482567
- published 10 Nov 2019
- disclosed 9 Nov 2019
Introduced: 9 Nov 2019
CVE-2019-18840 Open this link in a new tabHow to fix?
Upgrade Debian:unstable wolfssl to version 4.2.0+dfsg-3 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream wolfssl package and not the wolfssl package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
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.