CVE-2019-1551 vulnerability in OpenSSL and Other Products
Published on December 6, 2019
rsaz_512_sqr overflow bug on x86_64
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).
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Products Associated with CVE-2019-1551
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Affected Versions
OpenSSL:- Version Fixed in OpenSSL 1.1.1e (Affected 1.1.1-1.1.1d) is affected.
- Version Fixed in OpenSSL 1.0.2u (Affected 1.0.2-1.0.2t) is affected.
Exploit Probability
EPSS
3.35%
Percentile
87.07%
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.