CVE-2020-12457 Denial of service in n/a
An attacker can cause a denial of service in wolfSSL by sending multiple crafted ChangeCipherSpec messages, leading to an infinite loop.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-12457?
CVE-2020-12457 is a high-severity denial of service vulnerability in Wolfssl Wolfssl, published on 21 Aug 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in wolfSSL before 4.5.0. It mishandles the change_cipher_spec (CCS) message processing logic for TLS 1.3. If an attacker sends ChangeCipherSpec messages in a crafted way involving more than one in a row, the server becomes stuck in the ProcessReply() loop, i.e., a denial of service.
Weakness: CWE-835
Which versions are affected by CVE-2020-12457?
It affects 1 product.
Products include Wolfssl Wolfssl.
How do I fix CVE-2020-12457?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2020-12457 being exploited?
There is no known exploitation of CVE-2020-12457 in the wild and no public exploit code.
Other vulnerabilities in Wolfssl Wolfssl
Sources
Also known as DEBIAN-CVE-2020-12457, GHSA-85m8-xxmw-3hpv, UBUNTU-CVE-2020-12457.