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-dev (Affected 1.1.1-1.1.1d). Fixed in OpenSSL 1.0.2u-dev (Affected 1.0.2-1.0.2t).
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)
ReferencesDSA-4594-1
NVD severitymedium
Debian Bugs947949

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
openssl (PTS)jessie1.0.1t-1+deb8u8fixed
jessie (security)1.0.1t-1+deb8u12fixed
stretch1.1.0k-1~deb9u1vulnerable
stretch (security)1.1.0l-1~deb9u1vulnerable
buster, buster (security)1.1.1d-0+deb10u2vulnerable
bullseye, sid1.1.1d-2vulnerable
openssl1.0 (PTS)stretch1.0.2s-1~deb9u1vulnerable
stretch (security)1.0.2u-1~deb9u1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
opensslsource(unstable)(unfixed)low947949
opensslsourcejessie(not affected)
openssl1.0source(unstable)(unfixed)low
openssl1.0sourcestretch1.0.2u-1~deb9u1DSA-4594-1

Notes

[buster] - openssl <postponed> (Wait until next upstream security release)
[stretch] - openssl <postponed> (Wait until next upstream security release)
[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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