CVE-2019-1547

描述

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).

如何修補 CVE-2019-1547

要修補 CVE-2019-1547,請將受影響套件升級到下列已修補版本。

• —升級至 1.1.1d-r0 或更新版本
• —升級至 1.1.1d-r1 或更新版本

CVE-2019-1547 正在被利用嗎?

低 — EPSS 為 1.2%,目前沒有觀察到大規模利用活動。

受影響套件(2)

• >= 1.0.2, < 1.1.1d-r0
• from 0, < 1.1.1d-r1

CVSS 分數

參考連結(1)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2019-1547