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CVE-2021-4160 Detail

Current Description

There is a carry propagation bug in the MIPS32 and MIPS64 squaring procedure. Many EC algorithms are affected, including some of the TLS 1.3 default curves. Impact was not analyzed in detail, because the pre-requisites for attack are considered unlikely and include reusing private keys. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH are considered just feasible (although very difficult) because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be significant. However, for an attack on TLS to be meaningful, the server would have to share the DH private key among multiple clients, which is no longer an option since CVE-2016-0701. This issue affects OpenSSL versions 1.0.2, 1.1.1 and 3.0.0. It was addressed in the releases of 1.1.1m and 3.0.1 on the 15th of December 2021. For the 1.0.2 release it is addressed in git commit 6fc1aaaf3 that is available to premium support customers only. It will be made available in 1.0.2zc when it is released. The issue only affects OpenSSL on MIPS platforms. Fixed in OpenSSL 3.0.1 (Affected 3.0.0). Fixed in OpenSSL 1.1.1m (Affected 1.1.1-1.1.1l). Fixed in OpenSSL 1.0.2zc-dev (Affected 1.0.2-1.0.2zb).


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  5.9 MEDIUM
Vector:  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=3bf7b73ea7123045b8f972badc67ed6878e6c37f Patch  Vendor Advisory 
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=6fc1aaaf303185aa5e483e06bdfae16daa9193a7 Broken Link 
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=e9e726506cd2a3fd9c0f12daf8cc1fe934c7dddb Patch  Vendor Advisory 
https://www.debian.org/security/2022/dsa-5103 Third Party Advisory 
https://www.openssl.org/news/secadv/20220128.txt Vendor Advisory 
https://www.oracle.com/security-alerts/cpuapr2022.html

Weakness Enumeration

CWE-ID CWE Name Source
NVD-CWE-noinfo Insufficient Information cwe source acceptance level NIST  

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Change History

4 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-4160
NVD Published Date:
01/28/2022
NVD Last Modified:
04/19/2022
Source:
OpenSSL Software Foundation