CVE-2016-7055

Advisory lineage Upstream: 0 Downstream: 12
Modified
Published: 04 May 2017, 20:00
Last modified:06 Aug 2024, 01:50

Vulnerability Summary

Overall Risk (default)
low
24/100
CVSS Score
5.9 MEDIUM
v3.1 (nvd)
EPSS Score
2.69% LOW
3% probability +0.69%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

04 May 2017, 20:00
Published
Vulnerability first disclosed
06 Aug 2024, 01:50
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
  • v2.0•LOW•Score: 2.6AV:N/AC:H/Au:N/C:N/I:N/A:P

EPSS Trends

Current EPSS score: 2.69%• Percentile: 86%

Affected Systems

  • nodejs•node.js

    ≥ 4.0.0, ≤ 4.1.2 | ≥ 4.2.0, < 4.7.3 | ≥ 6.0.0, ≤ 6.8.1 | ≥ 6.9.0, < 6.9.5 | ≥ 7.0.0, < 7.5.0

  • Unknown•OpenSSL

    ≥ 1.0.2, < 1.0.2k | ≥ 1.1.0, < 1.1.0c

References (15)