CVE-2018-0732

NameCVE-2018-0732
DescriptionDuring key agreement in a TLS handshake using a DH(E) based ciphersuite a malicious server can send a very large prime value to the client. This will cause the client to spend an unreasonably long period of time generating a key for this prime resulting in a hang until the client has finished. This could be exploited in a Denial Of Service attack. Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h). Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2-1.0.2o).
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-1449-1
NVD severitymedium (attack range: remote)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
openssl (PTS)jessie1.0.1t-1+deb8u8vulnerable
jessie (security)1.0.1t-1+deb8u9fixed
stretch (security), stretch1.1.0f-3+deb9u2vulnerable
buster, sid1.1.1-2fixed
openssl1.0 (PTS)stretch (security), stretch1.0.2l-2+deb9u3vulnerable
buster, sid1.0.2o-1vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
opensslsource(unstable)1.1.1-1low
opensslsourcejessie1.0.1t-1+deb8u9mediumDLA-1449-1
openssl1.0source(unstable)(unfixed)low

Notes

[stretch] - openssl <postponed> (Minor issue, can be fixed along with next OpenSSL security release)
[stretch] - openssl1.0 <postponed> (Minor issue, can be fixed along with next OpenSSL security release)
OpenSSL_1_1_0-stable: https://git.openssl.org/?p=openssl.git;a=commit;h=ea7abeeabf92b7aca160bdd0208636d4da69f4f4
OpenSSL_1_0_2-stable: https://git.openssl.org/?p=openssl.git;a=commit;h=3984ef0b72831da8b3ece4745cac4f8575b19098
https://www.openssl.org/news/secadv/20180612.txt

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