libwolfssl23: In wolfSSL 4.1.0 through 4.2.0c, there are missing sanity checks of memory accesses in parsing ASN.1 certificate data...
CVE-2019-18840 is fixed in libwolfssl23 on 1 platform by libwolfssl23 4.2.0+dfsg-3 (version 4.2.0+dfsg-3), released November 9, 2019. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libwolfssl23 · Ubuntu 20.04 LTS (focal) | 4.2.0+dfsg-3 | libwolfssl23 4.2.0+dfsg-3 | Nov 9, 2019 |
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