CVE-2020-1968

NameCVE-2020-1968
DescriptionThe 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).
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2378-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
openssl (PTS)stretch (security), stretch1.1.0l-1~deb9u1fixed
buster, buster (security)1.1.1d-0+deb10u3fixed
bullseye, sid1.1.1g-1fixed
openssl1.0 (PTS)stretch1.0.2u-1~deb9u1vulnerable
stretch (security)1.0.2u-1~deb9u2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
opensslsource(unstable)1.1.0c-1
openssl1.0sourcestretch1.0.2u-1~deb9u2DLA-2378-1
openssl1.0source(unstable)(unfixed)

Notes

https://www.openssl.org/news/secadv/20200909.txt
https://raccoon-attack.com/
Fixed DH ciphersuites removed upstream in 1.1.0~pre2:
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=bc71f91064a3eec10310fa4cc14fe2a3fd9bc7bb (OpenSSL_1_1_0-pre2)

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