Description
Normally in OpenSSL EC groups always have a co-factor present and this is
used in side channel resistant code paths. However, in some cases, it is
possible to construct a group using explicit parameters (instead of using a
named curve). In those cases it is possible that such a group does not have
the cofactor present. This can occur even where all the parameters match a
known named curve. If such a curve is used then OpenSSL falls back to
non-side channel resistant code paths which may result in full key recovery
during an ECDSA signature operation. In order to be vulnerable an attacker
would have 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. For the avoidance of doubt libssl is not
vulnerable because explicit parameters are never used. Fixed in OpenSSL
1.1.1d (Affected 1.1.1-1.1.1c). Fixed in OpenSSL 1.1.0l (Affected
1.1.0-1.1.0k). Fixed in OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s).
Notes
mdeslaur | code isn't compiled into edk2 |
Package
Upstream: | needs-triage
|
Ubuntu 12.04 ESM (Precise Pangolin): | DNE
|
Ubuntu 14.04 ESM (Trusty Tahr): | DNE
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Ubuntu 16.04 LTS (Xenial Xerus): | DNE
|
Ubuntu 18.04 LTS (Bionic Beaver): | released
(1.0.2n-1ubuntu5.4)
|
Ubuntu 20.04 LTS (Focal Fossa): | DNE
|
Ubuntu 20.10 (Groovy Gorilla): | DNE
|
Updated: 2021-02-20 10:44:13 UTC (commit 8af355cec8a5a0247d3d552c6849ca6ed7c1e65c)