sshd & [USN-2459-1] OpenSSL vulnerabilities

Vangelis Katsikaros ibob17 at yahoo.gr
Tue Jan 13 11:42:36 UTC 2015


Hi

Sorry in case the question is stupid :) Does the ssh service need a restart 
after this update?

Regards
Vangelis

> ==========================================================================
> Ubuntu Security Notice USN-2459-1
> January 12, 2015
>
> openssl vulnerabilities
> ==========================================================================
>
> A security issue affects these releases of Ubuntu and its derivatives:
>
> - Ubuntu 14.10
> - Ubuntu 14.04 LTS
> - Ubuntu 12.04 LTS
> - Ubuntu 10.04 LTS
>
> Summary:
>
> Several security issues were fixed in OpenSSL.
>
> Software Description:
> - openssl: Secure Socket Layer (SSL) cryptographic library and tools
>
> Details:
>
> Pieter Wuille discovered that OpenSSL incorrectly handled Bignum squaring.
> (CVE-2014-3570)
>
> Markus Stenberg discovered that OpenSSL incorrectly handled certain crafted
> DTLS messages. A remote attacker could use this issue to cause OpenSSL to
> crash, resulting in a denial of service. (CVE-2014-3571)
>
> Karthikeyan Bhargavan discovered that OpenSSL incorrectly handled certain
> handshakes. A remote attacker could possibly use this issue to downgrade to
> ECDH, removing forward secrecy from the ciphersuite. (CVE-2014-3572)
>
> Antti Karjalainen, Tuomo Untinen and Konrad Kraszewski discovered that
> OpenSSL incorrectly handled certain certificate fingerprints. A remote
> attacker could possibly use this issue to trick certain applications that
> rely on the uniqueness of fingerprints. (CVE-2014-8275)
>
> Karthikeyan Bhargavan discovered that OpenSSL incorrectly handled certain
> key exchanges. A remote attacker could possibly use this issue to downgrade
> the security of the session to EXPORT_RSA. (CVE-2015-0204)
>
> Karthikeyan Bhargavan discovered that OpenSSL incorrectly handled client
> authentication. A remote attacker could possibly use this issue to
> authenticate without the use of a private key in certain limited scenarios.
> This issue only affected Ubuntu 14.04 LTS and Ubuntu 14.10. (CVE-2015-0205)
>
> Chris Mueller discovered that OpenSSL incorrect handled memory when
> processing DTLS records. A remote attacker could use this issue to cause
> OpenSSL to consume resources, resulting in a denial of service. This issue
> only affected Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 14.10.
> (CVE-2015-0206)
>
> Update instructions:
>
> The problem can be corrected by updating your system to the following
> package versions:
>
> Ubuntu 14.10:
>   libssl1.0.0                     1.0.1f-1ubuntu9.1
>
> Ubuntu 14.04 LTS:
>   libssl1.0.0                     1.0.1f-1ubuntu2.8
>
> Ubuntu 12.04 LTS:
>   libssl1.0.0                     1.0.1-4ubuntu5.21
>
> Ubuntu 10.04 LTS:
>   libssl0.9.8                     0.9.8k-7ubuntu8.23
>
> After a standard system update you need to reboot your computer to make
> all the necessary changes.
>
> References:
>   http://www.ubuntu.com/usn/usn-2459-1
>   CVE-2014-3570, CVE-2014-3571, CVE-2014-3572, CVE-2014-8275,
>   CVE-2015-0204, CVE-2015-0205, CVE-2015-0206
>
> Package Information:
>   https://launchpad.net/ubuntu/+source/openssl/1.0.1f-1ubuntu9.1
>   https://launchpad.net/ubuntu/+source/openssl/1.0.1f-1ubuntu2.8
>   https://launchpad.net/ubuntu/+source/openssl/1.0.1-4ubuntu5.21
>   https://launchpad.net/ubuntu/+source/openssl/0.9.8k-7ubuntu8.23



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