Bug 2048651 (CVE-2021-4160) - CVE-2021-4160 openssl: Carry propagation bug in the MIPS32 and MIPS64 squaring procedure
Summary: CVE-2021-4160 openssl: Carry propagation bug in the MIPS32 and MIPS64 squarin...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2021-4160
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
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Whiteboard:
Depends On:
Blocks: 2048652
TreeView+ depends on / blocked
 
Reported: 2022-01-31 16:52 UTC by Pedro Sampaio
Modified: 2022-02-11 16:08 UTC (History)
40 users (show)

Fixed In Version:
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Last Closed: 2022-02-01 10:29:28 UTC


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Description Pedro Sampaio 2022-01-31 16:52:59 UTC
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).

References:

https://www.openssl.org/news/secadv/20220128.txt
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=336923c0c8d705cb8af5216b29a205662db0d590
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=3bf7b73ea7123045b8f972badc67ed6878e6c37f
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=e9e726506cd2a3fd9c0f12daf8cc1fe934c7dddb

Comment 2 juneau 2022-02-01 13:06:35 UTC
Services notaffected per RHEL analysis.


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