CVE-2019-1551

NameCVE-2019-1551
DescriptionThere is an overflow bug in the x64_64 Montgomery squaring procedure used in exponentiation with 512-bit moduli. No EC algorithms are affected. Analysis suggests that attacks against 2-prime RSA1024, 3-prime RSA1536, and DSA1024 as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH512 are considered just feasible. However, for an attack the target would have to re-use the DH512 private key, which is not recommended anyway. Also applications directly using the low level API BN_mod_exp may be affected if they use BN_FLG_CONSTTIME. Fixed in OpenSSL 1.1.1e (Affected 1.1.1-1.1.1d). Fixed in OpenSSL 1.0.2u (Affected 1.0.2-1.0.2t).
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-2952-1, DSA-4594-1, DSA-4855-1
Debian Bugs947949

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
opensslsourcejessie(not affected)
opensslsourcestretch1.1.0l-1~deb9u5DLA-2952-1
opensslsourcebuster1.1.1d-0+deb10u5DSA-4855-1
opensslsource(unstable)1.1.1e-1low947949
openssl1.0sourcestretch1.0.2u-1~deb9u1DSA-4594-1
openssl1.0source(unstable)(unfixed)low

Notes

[jessie] - openssl <not-affected> (Affected modules are not present in Jessie)
https://www.openssl.org/news/secadv/20191206.txt
OpenSSL_1_1_1-stable: https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=419102400a2811582a7a3d4a4e317d72e5ce0a8f
OpenSSL_1_0_2-stable: https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=f1c5eea8a817075d31e43f5876993c6710238c98

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