CVE-2019-1551 rsaz_512_sqr overflow bug on x86_64
An integer overflow in OpenSSL's Montgomery squaring allows potential recovery of private keys from Diffie-Hellman operations, requiring an upgrade to secure versions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2019-1551?
CVE-2019-1551 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 6 Dec 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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).
Weakness: CWE-190
Which versions are affected by CVE-2019-1551?
It affects 9 products.
Linux distribution packages (31)
openssl Red Hat:enterprise_linux:8::baseos | All versions | 1:1.1.1g-11.el8 |
openssl-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 1:1.1.1g-11.el8 |
openssl-debugsource Red Hat:enterprise_linux:8::baseos | All versions | 1:1.1.1g-11.el8 |
openssl-devel Red Hat:enterprise_linux:8::baseos | All versions | 1:1.1.1g-11.el8 |
openssl-libs Red Hat:enterprise_linux:8::baseos | All versions | 1:1.1.1g-11.el8 |
openssl-libs-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 1:1.1.1g-11.el8 |
openssl-perl Red Hat:enterprise_linux:8::baseos | All versions | 1:1.1.1g-11.el8 |
openssl SUSE:Enterprise Storage 5 | All versions | 1.0.2j-60.60.1 |
openssl-1_0_0 SUSE:Enterprise Storage 6 | All versions | 1.0.2p-3.25.1 |
openssl SUSE:HPE Helion OpenStack 8 | All versions | 1.0.2j-60.60.1 |
openssl-1_0_0 SUSE:Linux Enterprise Desktop 12 SP4 | All versions | 1.0.2p-3.14.1 |
openssl-1_1 SUSE:Linux Enterprise Module for Basesystem 15 | All versions | 1.1.0i-4.27.1 |
openssl-1_1 SUSE:Linux Enterprise Module for Basesystem 15 SP1 | All versions | 1.1.0i-14.6.1 |
openssl-1_0_0 SUSE:Linux Enterprise Module for Legacy 15 | All versions | 1.0.2p-3.25.1 |
openssl-1_0_0 SUSE:Linux Enterprise Module for Legacy 15 SP1 | All versions | 1.0.2p-3.25.1 |
openssl SUSE:Linux Enterprise Server 12 SP2-BCL | All versions | 1.0.2j-60.60.1 |
openssl SUSE:Linux Enterprise Server 12 SP2-LTSS | All versions | 1.0.2j-60.60.1 |
openssl SUSE:Linux Enterprise Server 12 SP3-BCL | All versions | 1.0.2j-60.60.1 |
openssl SUSE:Linux Enterprise Server 12 SP3-LTSS | All versions | 1.0.2j-60.60.1 |
openssl-1_0_0 SUSE:Linux Enterprise Server 12 SP4 | All versions | 1.0.2p-3.14.1 |
openssl-1_0_0 SUSE:Linux Enterprise Server 12 SP5 | All versions | 1.0.2p-3.14.1 |
openssl SUSE:Linux Enterprise Server for SAP Applications 12 SP2 | All versions | 1.0.2j-60.60.1 |
openssl SUSE:Linux Enterprise Server for SAP Applications 12 SP3 | All versions | 1.0.2j-60.60.1 |
openssl-1_0_0 SUSE:Linux Enterprise Server for SAP Applications 12 SP4 | All versions | 1.0.2p-3.14.1 |
openssl-1_0_0 SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 1.0.2p-3.14.1 |
openssl-1_0_0 SUSE:Linux Enterprise Software Development Kit 12 SP4 | All versions | 1.0.2p-3.14.1 |
openssl-1_0_0 SUSE:Linux Enterprise Software Development Kit 12 SP5 | All versions | 1.0.2p-3.14.1 |
openssl SUSE:OpenStack Cloud 7 | All versions | 1.0.2j-60.60.1 |
openssl SUSE:OpenStack Cloud 8 | All versions | 1.0.2j-60.60.1 |
openssl SUSE:OpenStack Cloud Crowbar 8 | All versions | 1.0.2j-60.60.1 |
openssl-1_1 openSUSE:Leap 15.1 | All versions | 1.1.0i-lp151.8.6.1 |
Products include Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Openssl Openssl, Opensuse Leap, Oracle Enterprise Manager Ops Center and 3 more.
How do I fix CVE-2019-1551?
Upgrade to a fixed version.
Is CVE-2019-1551 being exploited?
There is no known exploitation of CVE-2019-1551 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as ALPINE-CVE-2019-1551, CLEANSTART-2026-JO98331, DEBIAN-CVE-2019-1551, DSA-4594-1, GHSA-fcc6-m5v9-xcgq, JLSEC-2026-216 and 10 more.