CVE-2015-7940

Description

The Bouncy Castle Java library before 1.51 does not validate a point is withing the elliptic curve, which makes it easier for remote attackers to obtain private keys via a series of crafted elliptic curve Diffie Hellman (ECDH) key exchanges, aka an "invalid curve attack."

How to fix CVE-2015-7940

To remediate CVE-2015-7940, upgrade the affected package to a fixed version below.

• Debian/bouncycastle—upgrade to 1.51-1 or later
• Debian/bouncycastle—upgrade to 1.44+dfsg-2+deb6u1 or later
• —upgrade to 1.44+dfsg-3.1+deb7u1 or later
• —upgrade to 1.51 or later
• —upgrade to 1.51 or later
• —upgrade to 1.51 or later

Is CVE-2015-7940 being exploited?

Low — EPSS is 1.0%, meaning exploitation activity has not been observed at scale.

Affected packages (6)

• from 0, < 1.51-1
• from 0, < 1.44+dfsg-2+deb6u1
• from 0, < 1.44+dfsg-3.1+deb7u1
• from 0, < 1.51
• from 0, < 1.51
• from 0, < 1.51

References (24)

• ADVISORYgithub.com/advisories/GHSA-4mv7-cq75-3qjm
• ADVISORYnvd.nist.gov/vuln/detail/CVE-2015-7940
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2015-7940
• WEBlists.fedoraproject.org/pipermail/package-announce/2016-January/174915.html