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Debian Security Advisory DSA-3417-1                   security@debian.org
https://www.debian.org/security/                            Luciano Bello
December 14, 2015                     https://www.debian.org/security/faq
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Package        : bouncycastle
CVE ID         : CVE-2015-7940
Debian Bug     : 802671

Tibor Jager, Jörg Schwenk, and Juraj Somorovsky, from Horst Görtz
Institute for IT Security, published a paper in ESORICS 2015 where they
describe an invalid curve attack in Bouncy Castle Crypto, a Java library
for cryptography. An attacker is able to recover private Elliptic Curve
keys from different applications, for example, TLS servers.

More information:
http://web-in-security.blogspot.ca/2015/09/practical-invalid-curve-attacks.html
Practical Invalid Curve Attacks on TLS-ECDH:
http://euklid.org/pdf/ECC_Invalid_Curve.pdf

For the oldstable distribution (wheezy), this problem has been fixed
in version 1.44+dfsg-3.1+deb7u1.

For the stable distribution (jessie), this problem has been fixed in
version 1.49+dfsg-3+deb8u1.

For the unstable distribution (sid), this problem has been fixed in
version 1.51-2.

We recommend that you upgrade your bouncycastle packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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