| 1 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 2 |
Gentoo Linux Security Advisory GLSA 201603-15 |
| 3 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 4 |
https://security.gentoo.org/ |
| 5 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 6 |
|
| 7 |
Severity: Normal |
| 8 |
Title: OpenSSL: Multiple vulnerabilities |
| 9 |
Date: March 20, 2016 |
| 10 |
Bugs: #575548 |
| 11 |
ID: 201603-15 |
| 12 |
|
| 13 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 14 |
|
| 15 |
Synopsis |
| 16 |
======== |
| 17 |
|
| 18 |
Multiple vulnerabilities have been found in OpenSSL, the worst allowing |
| 19 |
remote attackers to decrypt TLS sessions. |
| 20 |
|
| 21 |
Background |
| 22 |
========== |
| 23 |
|
| 24 |
OpenSSL is an Open Source toolkit implementing the Secure Sockets Layer |
| 25 |
(SSL v2/v3) and Transport Layer Security (TLS v1) as well as a general |
| 26 |
purpose cryptography library. |
| 27 |
|
| 28 |
Affected packages |
| 29 |
================= |
| 30 |
|
| 31 |
------------------------------------------------------------------- |
| 32 |
Package / Vulnerable / Unaffected |
| 33 |
------------------------------------------------------------------- |
| 34 |
1 dev-libs/openssl < 1.0.2g-r2 >= 1.0.2g-r2 |
| 35 |
|
| 36 |
Description |
| 37 |
=========== |
| 38 |
|
| 39 |
Multiple vulnerabilities have been discovered in OpenSSL, the worst |
| 40 |
being a cross-protocol attack called DROWN that could lead to the |
| 41 |
decryption of TLS sessions. Please review the CVE identifiers |
| 42 |
referenced below for details. |
| 43 |
|
| 44 |
Impact |
| 45 |
====== |
| 46 |
|
| 47 |
A remote attacker could decrypt TLS sessions by using a server |
| 48 |
supporting SSLv2 and EXPORT cipher suites as a |
| 49 |
Bleichenbacher RSA padding oracle, cause a Denial of Service condition, |
| 50 |
obtain sensitive information from memory and (in rare circumstances) |
| 51 |
recover RSA keys. |
| 52 |
|
| 53 |
Workaround |
| 54 |
========== |
| 55 |
|
| 56 |
A workaround for DROWN is disabling the SSLv2 protocol on all SSL/TLS |
| 57 |
servers. |
| 58 |
|
| 59 |
Resolution |
| 60 |
========== |
| 61 |
|
| 62 |
All OpenSSL users should upgrade to the latest version: |
| 63 |
|
| 64 |
# emerge --sync |
| 65 |
# emerge --ask --oneshot --verbose ">=dev-libs/openssl-1.0.2g-r2" |
| 66 |
|
| 67 |
Please note that beginning with OpenSSL 1.0.2, in order to mitigate the |
| 68 |
DROWN attack, the OpenSSL project disables SSLv2 by default at |
| 69 |
build-time. As this change would cause severe issues with some Gentoo |
| 70 |
packages that depend on OpenSSL, Gentoo still ships OpenSSL with SSLv2 |
| 71 |
enabled at build-time. Note that this does not mean that you are still |
| 72 |
vulnerable to DROWN because the OpenSSL project has taken further |
| 73 |
precautions and applications would need to explicitly request SSLv2. We |
| 74 |
are working on a migration path to phase out SSLv2 that ensures that no |
| 75 |
user-facing issues occur. Please reference bug 576128 for further |
| 76 |
details on how this decision was made. |
| 77 |
|
| 78 |
References |
| 79 |
========== |
| 80 |
|
| 81 |
[ 1 ] CVE-2016-0702 |
| 82 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0702 |
| 83 |
[ 2 ] CVE-2016-0703 |
| 84 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0703 |
| 85 |
[ 3 ] CVE-2016-0704 |
| 86 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0704 |
| 87 |
[ 4 ] CVE-2016-0705 |
| 88 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0705 |
| 89 |
[ 5 ] CVE-2016-0797 |
| 90 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0797 |
| 91 |
[ 6 ] CVE-2016-0798 |
| 92 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0798 |
| 93 |
[ 7 ] CVE-2016-0799 |
| 94 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0799 |
| 95 |
[ 8 ] CVE-2016-0800 |
| 96 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0800 |
| 97 |
|
| 98 |
Availability |
| 99 |
============ |
| 100 |
|
| 101 |
This GLSA and any updates to it are available for viewing at |
| 102 |
the Gentoo Security Website: |
| 103 |
|
| 104 |
https://security.gentoo.org/glsa/201603-15 |
| 105 |
|
| 106 |
Concerns? |
| 107 |
========= |
| 108 |
|
| 109 |
Security is a primary focus of Gentoo Linux and ensuring the |
| 110 |
confidentiality and security of our users' machines is of utmost |
| 111 |
importance to us. Any security concerns should be addressed to |
| 112 |
security@g.o or alternatively, you may file a bug at |
| 113 |
https://bugs.gentoo.org. |
| 114 |
|
| 115 |
License |
| 116 |
======= |
| 117 |
|
| 118 |
Copyright 2016 Gentoo Foundation, Inc; referenced text |
| 119 |
belongs to its owner(s). |
| 120 |
|
| 121 |
The contents of this document are licensed under the |
| 122 |
Creative Commons - Attribution / Share Alike license. |
| 123 |
|
| 124 |
http://creativecommons.org/licenses/by-sa/2.5 |
Archives