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CVE-2021-4160

Status Candidate

Overview

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).

Related Files

Gentoo Linux Security Advisory 202210-02
Posted Oct 17, 2022
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202210-2 - Multiple vulnerabilities have been discovered in OpenSSL, the worst of which could result in denial of service. Versions less than 1.1.1q are affected.

tags | advisory, denial of service, vulnerability
systems | linux, gentoo
advisories | CVE-2020-1968, CVE-2021-3711, CVE-2021-3712, CVE-2021-4160, CVE-2022-0778, CVE-2022-1292, CVE-2022-1473, CVE-2022-2097
SHA-256 | e8a24ea6bd3d06d9f7c4b981793ddc01bf27c0b5de50f88e95ea9d23d62c2456
Debian Security Advisory 5103-1
Posted Mar 28, 2022
Authored by Debian | Site debian.org

Debian Linux Security Advisory 5103-1 - Tavis Ormandy discovered that the BN_mod_sqrt() function of OpenSSL could be tricked into an infinite loop. This could result in denial of service via malformed certificates.

tags | advisory, denial of service
systems | linux, debian
advisories | CVE-2021-4160, CVE-2022-0778
SHA-256 | 7e8b206a447d884b492daca09525ab567463a9f49acb4d20581af37b4ca4a50c
OpenSSL Security Advisory 20220128
Posted Jan 28, 2022
Site openssl.org

OpenSSL Security Advisory 20220128 - 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.

tags | advisory
advisories | CVE-2016-0701, CVE-2021-4160
SHA-256 | 9383b0cde7f5a7a29255898a505a908a2012ed0523afb1a778544fce277e37da
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