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CVE-2021-4160

MEDIUMCVSS 5.9/10EPSS 3.80%

Last modified

CVE-2021-4160 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. 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. EPSS estimates a 3.80% chance of exploitation in the next 30 days.

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).

Metrics

CVSS 3.1
5.9/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability
3.80%

88.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
OpensslOpenssl>= 1.0.2, <= 1.0.2zb
OpensslOpenssl>= 1.1.1, < 1.1.1m
OpensslOpenssl3.0.0
DebianDebian Linux9.0
DebianDebian Linux10.0
DebianDebian Linux11.0
OracleHealth Sciences Inform Publisher6.2.1.1
OracleHealth Sciences Inform Publisher6.3.1.1
OracleJd Edwards Enterpriseone Tools9.2.6.3
OracleJd Edwards World Securitya9.4
OraclePeoplesoft Enterprise Peopletools8.58
OraclePeoplesoft Enterprise Peopletools8.59
SiemensSinec Ins< 1.0
SiemensSinec Ins1.0
OracleEnterprise Manager Ops Center12.4.0.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-4160?
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).
How severe is CVE-2021-4160?
CVE-2021-4160 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 3.80% probability of exploitation in the next 30 days.
How do I fix CVE-2021-4160?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST