# CVE-2017-3736: libssl1.0.0: There is a carry propagating bug in the x86_64 Montgomery squaring procedure in OpenSSL before 1.0.2m and 1.1.0 befor...

CVE-2017-3736 is fixed in 2 products on 1 platform, first by libssl1.0.0 1.0.2g-1ubuntu14, released November 1, 2017. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2017-3736
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.1013
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 1, 2017

## Description

There is a carry propagating bug in the x86_64 Montgomery squaring procedure in OpenSSL before 1.0.2m and 1.1.0 before 1.1.0g. No EC algorithms are affected. 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 very significant and likely only accessible to a limited number of attackers. An attacker would additionally need online access to an unpatched system using the target private key in a scenario with persistent DH parameters and a private key that is shared between multiple clients. This only affects processors that support the BMI1, BMI2 and ADX extensions like Intel Broadwell (5th generation) and later or AMD Ryzen.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libssl1.0.0 Ubuntu 18.04.6 LTS (bionic) | 1.0.2g-1ubuntu14 | [libssl1.0.0 1.0.2g-1ubuntu14](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libssl1.0.0-1.0.2g-1ubuntu14.md) | Nov 1, 2017 |
| Linux | openssl Ubuntu 18.04.6 LTS (bionic) | 1.0.2g-1ubuntu14 | [openssl 1.0.2g-1ubuntu14](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-openssl-1.0.2g-1ubuntu14.md) | Nov 1, 2017 |

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