CVE-2019-18840
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductWolfssl
PublishedNov 9, 2019
First seenNov 9, 2019
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| wolfssl wolfssl | 4.1.0 ≤ v ≤ 4.2.0c | — |
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