CVE-2020-1968 Raccoon attack
Attackers can eavesdrop on encrypted TLS communications by exploiting DH secret reuse in OpenSSL, requiring DH ciphersuites.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-1968?
CVE-2020-1968 is a low-severity vulnerability in Canonical Ubuntu Linux, published on 9 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Raccoon attack exploits a flaw in the TLS specification which can lead to an attacker being able to compute the pre-master secret in connections which have used a Diffie-Hellman (DH) based ciphersuite. In such a case this would result in the attacker being able to eavesdrop on all encrypted communications sent over that TLS connection. The attack can only be exploited if an implementation re-uses a DH secret across multiple TLS connections. Note that this issue only impacts DH ciphersuites and not ECDH ciphersuites. This issue affects OpenSSL 1.0.2 which is out of support and no longer receiving public updates. OpenSSL 1.1.1 is not vulnerable to this issue. Fixed in OpenSSL 1.0.2w (Affected 1.0.2-1.0.2v).
Weakness: CWE-203
Which versions are affected by CVE-2020-1968?
It affects 15 products.
Linux distribution packages (3)
openssl SUSE:Linux Enterprise Point of Sale 11 SP3 | All versions | 0.9.8j-0.106.34.1 |
openssl SUSE:Linux Enterprise Server 11 SP4-LTSS | All versions | 0.9.8j-0.106.34.1 |
openssl1 SUSE:Linux Enterprise Server 11-SECURITY | All versions | 1.0.1g-0.58.27.2 |
Products include Canonical Ubuntu Linux, Debian Debian Linux, Fujitsu M10-1 Firmware, Fujitsu M10-4 Firmware, Fujitsu M10-4s Firmware, Fujitsu M12-1 Firmware and 9 more.
How do I fix CVE-2020-1968?
Upgrade to a fixed version.
Is CVE-2020-1968 being exploited?
There is no known exploitation of CVE-2020-1968 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as DEBIAN-CVE-2020-1968, DLA-2378-1, GHSA-mh8f-5gw2-5wgh, SUSE-SU-2020:14491-1, SUSE-SU-2020:14511-1, UBUNTU-CVE-2020-1968.