PT-2019-3788 · Openssl+9 · Openssl+9
Published
2019-09-10
·
Updated
2026-04-27
·
CVE-2019-1547
CVSS v3.1
4.7
Medium
| Vector | AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N |
Name of the Vulnerable Software and Affected Versions
OpenSSL versions 1.0.2 through 1.0.2s
OpenSSL versions 1.1.0 through 1.1.0k
OpenSSL versions 1.1.1 through 1.1.1c
Description
The issue is related to the absence of encryption measures in the ec err.c and ec lib.c functions of the OpenSSL library. Normally, OpenSSL EC groups have a co-factor present, which is used in side channel resistant code paths. However, in some cases, it is possible to construct a group using explicit parameters instead of a named curve, which may not have the co-factor present. This can occur even when all parameters match a known named curve. If such a curve is used, OpenSSL falls back to non-side channel resistant code paths, which may result in full key recovery during an ECDSA signature operation. An attacker would need to have the ability to time the creation of a large number of signatures where explicit parameters with no co-factor present are in use by an application using libcrypto.
Recommendations
For OpenSSL versions 1.0.2 through 1.0.2s, update to version 1.0.2t.
For OpenSSL versions 1.1.0 through 1.1.0k, update to version 1.1.0l.
For OpenSSL versions 1.1.1 through 1.1.1c, update to version 1.1.1d.
Exploit
Fix
Missing Encryption of Sensitive Data
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Astra Linux
Centos
Ibm Aix
Mysql Server
Openssl
Red Hat
Suse
Ubuntu
Virtualbox