Vulnerability · Published Aug 24, 2020 · Assigned by mitre

CVE-2020-24613

Medium 6.8

In plain English

A medium-severity security flaw in the wolfssl package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)6.8Medium

Exploit odds (30 days)0.9%top 41.3% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

wolfSSL before 4.5.0 mishandles TLS 1.3 server data in the WAIT_CERT_CR state, within SanityCheckTls13MsgReceived() in tls13.c. This is an incorrect implementation of the TLS 1.3 client state machine. This allows attackers in a privileged network position to completely impersonate any TLS 1.3 servers, and read or modify potentially sensitive information between clients using the wolfSSL library and these TLS servers.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	wolfssl	4.5.0+dfsg-1	DEBIAN-CVE-2020-24613
Debian:13	wolfssl	4.5.0+dfsg-1	DEBIAN-CVE-2020-24613

Affected products (as reported)

Vendor	Product	Versions
n/a	n/a	n/a

References

https://research.nccgroup.com/2020/08/24/technical-advisory-wolfssl-tls-1-3-client-man-in-the-middle-attack/ x_refsource_MISC