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
- —upgrade to 1.1.1e-1 or later
- —upgrade to 1.1.0l-1~deb9u5 or later
- —upgrade to 1.1.1d-0+deb10u5 or later
- —upgrade to 1.0.2u-1~deb9u1 or later
Is CVE-2019-1551 being exploited?
Low — EPSS is 2.8%, meaning exploitation activity has not been observed at scale.
Affected packages (6)
- from 0, < 1.1.1d-r2
- from 0, < 1.1.1d-r3
- from 0, < 1.1.1e-1
- from 0, < 1.1.0l-1~deb9u5
- from 0, < 1.1.1d-0+deb10u5
- from 0, < 1.0.2u-1~deb9u1
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 |