Synopsis: Important: openssl security update
Advisory ID: SLSA-2016:1940-1
Issue Date: 2016-09-27
CVE Numbers: CVE-2016-2177
CVE-2016-2178
CVE-2016-2180
CVE-2016-2182
CVE-2016-2181
CVE-2016-2183
CVE-2016-2179
CVE-2016-6302
CVE-2016-6306
CVE-2016-6304
--
Security Fix(es):
* A memory leak flaw was found in the way OpenSSL handled TLS status
request extension data during session renegotiation. A remote attacker
could cause a TLS server using OpenSSL to consume an excessive amount of
memory and, possibly, exit unexpectedly after exhausting all available
memory, if it enabled OCSP stapling support. (CVE-2016-6304)
* It was discovered that OpenSSL did not always use constant time
operations when computing Digital Signature Algorithm (DSA) signatures. A
local attacker could possibly use this flaw to obtain a private DSA key
belonging to another user or service running on the same system.
(CVE-2016-2178)
* It was discovered that the Datagram TLS (DTLS) implementation could fail
to release memory in certain cases. A malicious DTLS client could cause a
DTLS server using OpenSSL to consume an excessive amount of memory and,
possibly, exit unexpectedly after exhausting all available memory.
(CVE-2016-2179)
* A flaw was found in the Datagram TLS (DTLS) replay protection
implementation in OpenSSL. A remote attacker could possibly use this flaw
to make a DTLS server using OpenSSL to reject further packets sent from a
DTLS client over an established DTLS connection. (CVE-2016-2181)
* An out of bounds write flaw was discovered in the OpenSSL BN_bn2dec()
function. An attacker able to make an application using OpenSSL to process
a large BIGNUM could cause the application to crash or, possibly, execute
arbitrary code. (CVE-2016-2182)
* A flaw was found in the DES/3DES cipher was used as part of the TLS/SSL
protocol. A man-in-the-middle attacker could use this flaw to recover some
plaintext data by capturing large amounts of encrypted traffic between
TLS/SSL server and client if the communication used a DES/3DES based
ciphersuite. (CVE-2016-2183)
This update mitigates the CVE-2016-2183 issue by lowering priority of DES
cipher suites so they are not preferred over cipher suites using AES. For
compatibility reasons, DES cipher suites remain enabled by default and
included in the set of cipher suites identified by the HIGH cipher string.
Future updates may move them to MEDIUM or not enable them by default.
* An integer underflow flaw leading to a buffer over-read was found in the
way OpenSSL parsed TLS session tickets. A remote attacker could use this
flaw to crash a TLS server using OpenSSL if it used SHA-512 as HMAC for
session tickets. (CVE-2016-6302)
* Multiple integer overflow flaws were found in the way OpenSSL performed
pointer arithmetic. A remote attacker could possibly use these flaws to
cause a TLS/SSL server or client using OpenSSL to crash. (CVE-2016-2177)
* An out of bounds read flaw was found in the way OpenSSL formatted Public
Key Infrastructure Time-Stamp Protocol data for printing. An attacker
could possibly cause an application using OpenSSL to crash if it printed
time stamp data from the attacker. (CVE-2016-2180)
* Multiple out of bounds read flaws were found in the way OpenSSL handled
certain TLS/SSL protocol handshake messages. A remote attacker could
possibly use these flaws to crash a TLS/SSL server or client using
OpenSSL. (CVE-2016-6306)
--
SL6
x86_64
openssl-1.0.1e-48.sl6_8.3.i686.rpm
openssl-1.0.1e-48.sl6_8.3.x86_64.rpm
openssl-debuginfo-1.0.1e-48.sl6_8.3.i686.rpm
openssl-debuginfo-1.0.1e-48.sl6_8.3.x86_64.rpm
openssl-devel-1.0.1e-48.sl6_8.3.i686.rpm
openssl-devel-1.0.1e-48.sl6_8.3.x86_64.rpm
openssl-perl-1.0.1e-48.sl6_8.3.x86_64.rpm
openssl-static-1.0.1e-48.sl6_8.3.x86_64.rpm
i386
openssl-1.0.1e-48.sl6_8.3.i686.rpm
openssl-debuginfo-1.0.1e-48.sl6_8.3.i686.rpm
openssl-devel-1.0.1e-48.sl6_8.3.i686.rpm
openssl-perl-1.0.1e-48.sl6_8.3.i686.rpm
openssl-static-1.0.1e-48.sl6_8.3.i686.rpm
SL7
x86_64
openssl-1.0.1e-51.el7_2.7.x86_64.rpm
openssl-debuginfo-1.0.1e-51.el7_2.7.i686.rpm
openssl-debuginfo-1.0.1e-51.el7_2.7.x86_64.rpm
openssl-libs-1.0.1e-51.el7_2.7.i686.rpm
openssl-libs-1.0.1e-51.el7_2.7.x86_64.rpm
openssl-devel-1.0.1e-51.el7_2.7.i686.rpm
openssl-devel-1.0.1e-51.el7_2.7.x86_64.rpm
openssl-perl-1.0.1e-51.el7_2.7.x86_64.rpm
openssl-static-1.0.1e-51.el7_2.7.i686.rpm
openssl-static-1.0.1e-51.el7_2.7.x86_64.rpm
- Scientific Linux Development Team
