CVE-2016-7055

描述

There is a carry propagating bug in the Broadwell-specific Montgomery multiplication procedure in OpenSSL 1.0.2 and 1.1.0 before 1.1.0c that handles input lengths divisible by, but longer than 256 bits. Analysis suggests that attacks against RSA, DSA and DH private keys are impossible. This is because the subroutine in question is not used in operations with the private key itself and an input of the attacker's direct choice. Otherwise the bug can manifest itself as transient authentication and key negotiation failures or reproducible erroneous outcome of public-key operations with specially crafted input. Among EC algorithms only Brainpool P-512 curves are affected and one presumably can attack ECDH key negotiation. Impact was not analyzed in detail, because pre-requisites for attack are considered unlikely. Namely multiple clients have to choose the curve in question and the server has to share the private key among them, neither of which is default behaviour. Even then only clients that chose the curve will be affected.

如何修補 CVE-2016-7055

要修補 CVE-2016-7055,請將受影響套件升級到下列已修補版本。

• —升級至 1.0.2k-r0 或更新版本

CVE-2016-7055 正在被利用嗎?

中等 — EPSS 為 14.2%,可持續追蹤但非最高優先。

受影響套件(1)

• >= 1.0.2, < 1.0.2k-r0

CVSS 分數

參考連結(1)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2016-7055