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, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-1449-1, DSA-4348-1, DSA-4355-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
openssl (PTS)buster1.1.1n-0+deb10u3fixed
buster (security)1.1.1n-0+deb10u6fixed
bullseye1.1.1w-0+deb11u1fixed
bullseye (security)1.1.1n-0+deb11u5fixed
bookworm, bookworm (security)3.0.11-1~deb12u2fixed
trixie3.1.5-1fixed
sid3.1.5-1.1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
opensslsourcejessie1.0.1t-1+deb8u9DLA-1449-1
opensslsourcestretch1.1.0j-1~deb9u1DSA-4348-1
opensslsource(unstable)1.1.1-1low
openssl1.0sourcestretch1.0.2q-1~deb9u1DSA-4355-1
openssl1.0source(unstable)1.0.2q-1low

Notes

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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