CVE-2019-11873
Description
wolfSSL 4.0.0 has a Buffer Overflow in DoPreSharedKeys in tls13.c when a current identity size is greater than a client identity size. An attacker sends a crafted hello client packet over the network to a TLSv1.3 wolfSSL server. The length fields of the packet: record length, client hello length, total extensions length, PSK extension length, total identity length, and identity length contain their maximum value which is 2^16. The identity data field of the PSK extension of the packet contains the attack data, to be stored in the undefined memory (RAM) of the server. The size of the data is about 65 kB. Possibly the attacker can perform a remote code execution attack.
How to fix CVE-2019-11873
To remediate CVE-2019-11873, upgrade the affected package to a fixed version below.
- —upgrade to 4.1.0+dfsg-1 or later
Is CVE-2019-11873 being exploited?
Moderate — EPSS is 6.3%. Track this CVE but it's not at the top of the prioritisation list.
Affected packages (1)
- from 0, < 4.1.0+dfsg-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |