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[USN-3087-2] OpenSSL regression

Posted on 23 September 2016
Ubuntu Security

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Ubuntu Security Notice USN-3087-2
September 23, 2016

openssl regression
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

USN-3087-1 introduced a regression in OpenSSL.

Software Description:
- openssl: Secure Socket Layer (SSL) cryptographic library and tools

Details:

USN-3087-1 fixed vulnerabilities in OpenSSL. The fix for CVE-2016-2182 wa=
s
incomplete and caused a regression when parsing certificates. This update=

fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Shi Lei discovered that OpenSSL incorrectly handled the OCSP Status Requ=
est
extension. A remote attacker could possibly use this issue to cause memo=
ry
consumption, resulting in a denial of service. (CVE-2016-6304)
Guido Vranken discovered that OpenSSL used undefined behaviour when
performing pointer arithmetic. A remote attacker could possibly use this=

issue to cause OpenSSL to crash, resulting in a denial of service. This
issue has only been addressed in Ubuntu 16.04 LTS in this update.
(CVE-2016-2177)
C=C3=A9sar Pereida, Billy Brumley, and Yuval Yarom discovered that Open=
SSL
did not properly use constant-time operations when performing DSA signin=
g.
A remote attacker could possibly use this issue to perform a cache-timin=
g
attack and recover private DSA keys. (CVE-2016-2178)
Quan Luo discovered that OpenSSL did not properly restrict the lifetime=

of queue entries in the DTLS implementation. A remote attacker could
possibly use this issue to consume memory, resulting in a denial of
service. (CVE-2016-2179)
Shi Lei discovered that OpenSSL incorrectly handled memory in the
TS_OBJ_print_bio() function. A remote attacker could possibly use this
issue to cause a denial of service. (CVE-2016-2180)
It was discovered that the OpenSSL incorrectly handled the DTLS anti-re=
play
feature. A remote attacker could possibly use this issue to cause a deni=
al
of service. (CVE-2016-2181)
Shi Lei discovered that OpenSSL incorrectly validated division results.=
A
remote attacker could possibly use this issue to cause a denial of servi=
ce.
(CVE-2016-2182)
Karthik Bhargavan and Gaetan Leurent discovered that the DES and Triple=
DES
ciphers were vulnerable to birthday attacks. A remote attacker could
possibly use this flaw to obtain clear text data from long encrypted
sessions. This update moves DES from the HIGH cipher list to MEDIUM.
(CVE-2016-2183)
Shi Lei discovered that OpenSSL incorrectly handled certain ticket leng=
ths.
A remote attacker could use this issue to cause a denial of service.
(CVE-2016-6302)
Shi Lei discovered that OpenSSL incorrectly handled memory in the
MDC2_Update() function. A remote attacker could possibly use this issue =
to
cause a denial of service. (CVE-2016-6303)
Shi Lei discovered that OpenSSL incorrectly performed certain message
length checks. A remote attacker could possibly use this issue to cause =
a
denial of service. (CVE-2016-6306)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.04 LTS:
libssl1.0.0 1.0.2g-1ubuntu4.5

Ubuntu 14.04 LTS:
libssl1.0.0 1.0.1f-1ubuntu2.21

Ubuntu 12.04 LTS:
libssl1.0.0 1.0.1-4ubuntu5.38

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
http://www.ubuntu.com/usn/usn-3087-2
http://www.ubuntu.com/usn/usn-3087-1
https://launchpad.net/bugs/1626883

Package Information:
https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu4.5
https://launchpad.net/ubuntu/+source/openssl/1.0.1f-1ubuntu2.21
https://launchpad.net/ubuntu/+source/openssl/1.0.1-4ubuntu5.38



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