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 18.04 LTS: | not-affected
(uses system openssl1.0)
|
Ubuntu 20.04 LTS: | not-affected
(uses system openssl1.1)
|
Ubuntu 14.04 ESM: | not-affected
(uses system openssl)
|
Patches:
Package
Upstream: | released
(1.1.1d)
|
Ubuntu 18.04 LTS: | released
(1.1.1-1ubuntu2.1~18.04.6)
|
Ubuntu 20.04 LTS: | released
(1.1.1d-2ubuntu1)
|
Ubuntu 16.04 ESM: | released
(1.0.2g-1ubuntu4.16)
|
Ubuntu 14.04 ESM: | released
(1.0.1f-1ubuntu2.27+esm1)
|
Patches:
Package
Upstream: | needs-triage
|
Ubuntu 18.04 LTS: | released
(1.0.2n-1ubuntu5.4)
|
Ubuntu 20.04 LTS: | DNE
|
Ubuntu 14.04 ESM: | DNE
|
Patches:
Updated: 2022-04-13 13:45:30 UTC (commit f411bd370d482ef4385c4e751d121a4055fbc009)