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Debian Security Advisory 3437-1

Debian Security Advisory 3437-1
Posted Jan 11, 2016
Authored by Debian | Site debian.org

Debian Linux Security Advisory 3437-1 - Karthikeyan Bhargavan and Gaetan Leurent at INRIA discovered a flaw in the TLS 1.2 protocol which could allow the MD5 hash function to be used for signing ServerKeyExchange and Client Authentication packets during a TLS handshake. A man-in-the-middle attacker could exploit this flaw to conduct collision attacks to impersonate a TLS server or an authenticated TLS client.

tags | advisory, protocol
systems | linux, debian
advisories | CVE-2015-7575
SHA-256 | 868dce8773c5d2e53cf3af16d82945ada88658e24fa28370ccaf5449ba858dfc

Debian Security Advisory 3437-1

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Hash: SHA512

- -------------------------------------------------------------------------
Debian Security Advisory DSA-3437-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
January 09, 2016 https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : gnutls26
CVE ID : CVE-2015-7575

Karthikeyan Bhargavan and Gaetan Leurent at INRIA discovered a flaw in
the TLS 1.2 protocol which could allow the MD5 hash function to be used
for signing ServerKeyExchange and Client Authentication packets during a
TLS handshake. A man-in-the-middle attacker could exploit this flaw to
conduct collision attacks to impersonate a TLS server or an
authenticated TLS client.

More information can be found at
https://www.mitls.org/pages/attacks/SLOTH

For the oldstable distribution (wheezy), this problem has been fixed
in version 2.12.20-8+deb7u5.

We recommend that you upgrade your gnutls26 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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