CVE-2019-1551
openssl - security update
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).
How to fix CVE-2019-1551
To remediate CVE-2019-1551, upgrade the affected package to a fixed version below.
- —upgrade to 1.1.1d-r2 or later
- —upgrade to 1.1.1d-r3 or later
Is CVE-2019-1551 being exploited?
Moderate — EPSS is 14.3%. Track this CVE but it's not at the top of the prioritisation list.
Affected packages (2)
- >= 1.0.2, < 1.1.1d-r2
- from 0, < 1.1.1d-r3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |