CVE-2019-1551

Vulnerability Description

There 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).

CVSS Score

Affected Products

Related Weaknesses (CWE)

References

• http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00030.htmlMailing ListThird Party Advisory
• http://packetstormsecurity.com/files/155754/Slackware-Security-Advisory-openssl-Third Party AdvisoryVDB Entry
• https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=419102400a28115
• https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=f1c5eea8a817075
• https://lists.debian.org/debian-lts-announce/2022/03/msg00023.htmlMailing ListThird Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
• https://seclists.org/bugtraq/2019/Dec/39Mailing ListThird Party Advisory
• https://seclists.org/bugtraq/2019/Dec/46Mailing ListThird Party Advisory
• https://security.gentoo.org/glsa/202004-10Third Party Advisory
• https://security.netapp.com/advisory/ntap-20191210-0001/Third Party Advisory
• https://usn.ubuntu.com/4376-1/Third Party Advisory
• https://usn.ubuntu.com/4504-1/Third Party Advisory
• https://www.debian.org/security/2019/dsa-4594Third Party Advisory