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Information Exposure Affecting openssl package, versions <1.1.0f-3+deb9u1

Severity

 Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.17% (56th percentile)

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  • Snyk IDSNYK-DEBIAN9-OPENSSL-374226
  • published2 Nov 2017
  • disclosed2 Nov 2017
Report a new vulnerability Found a mistake?

Introduced: 2 Nov 2017

CVE-2017-3736  (opens in a new tab)
CWE-200  (opens in a new tab)

How to fix?

Upgrade Debian:9 openssl to version 1.1.0f-3+deb9u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssl package and not the openssl package as distributed by Debian. See How to fix? for Debian:9 relevant fixed versions and status.

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.

References