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).
Metrics
Affected Vendors & Products
References
History
No history.
MITRE
Status: PUBLISHED
Assigner: openssl
Published: 2019-12-06T17:20:14.842234Z
Updated: 2024-09-16T19:40:14.240Z
Reserved: 2018-11-28T00:00:00
Link: CVE-2019-1551
Vulnrichment
No data.
NVD
Status : Modified
Published: 2019-12-06T18:15:12.840
Modified: 2024-11-21T04:36:48.500
Link: CVE-2019-1551
Redhat