| 1 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 2 |
Gentoo Linux Security Advisory GLSA 201602-02 |
| 3 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 4 |
https://security.gentoo.org/ |
| 5 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 6 |
|
| 7 |
Severity: High |
| 8 |
Title: GNU C Library: Multiple vulnerabilities |
| 9 |
Date: February 17, 2016 |
| 10 |
Bugs: #516884, #517082, #521932, #529982, #532874, #538090, |
| 11 |
#538814, #540070, #541246, #541542, #547296, #552692, #574880 |
| 12 |
ID: 201602-02 |
| 13 |
|
| 14 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| 15 |
|
| 16 |
Synopsis |
| 17 |
======== |
| 18 |
|
| 19 |
Multiple vulnerabilities have been found in the GNU C library, the |
| 20 |
worst allowing for remote execution of arbitrary code. |
| 21 |
|
| 22 |
Background |
| 23 |
========== |
| 24 |
|
| 25 |
The GNU C library is the standard C library used by Gentoo Linux |
| 26 |
systems. |
| 27 |
|
| 28 |
Affected packages |
| 29 |
================= |
| 30 |
|
| 31 |
------------------------------------------------------------------- |
| 32 |
Package / Vulnerable / Unaffected |
| 33 |
------------------------------------------------------------------- |
| 34 |
1 sys-libs/glibc < 2.21-r2 >= 2.21-r2 |
| 35 |
|
| 36 |
Description |
| 37 |
=========== |
| 38 |
|
| 39 |
Multiple vulnerabilities have been discovered in the GNU C Library: |
| 40 |
|
| 41 |
* The Google Security Team and Red Hat discovered a stack-based buffer |
| 42 |
overflow in the send_dg() and send_vc() functions due to a buffer |
| 43 |
mismanagement when getaddrinfo() is called with AF_UNSPEC |
| 44 |
(CVE-2015-7547). |
| 45 |
* The strftime() function access invalid memory when passed |
| 46 |
out-of-range data, resulting in a crash (CVE-2015-8776). |
| 47 |
* An integer overflow was found in the __hcreate_r() function |
| 48 |
(CVE-2015-8778). |
| 49 |
* Multiple unbounded stack allocations were found in the catopen() |
| 50 |
function (CVE-2015-8779). |
| 51 |
|
| 52 |
Please review the CVEs referenced below for additional vulnerabilities |
| 53 |
that had already been fixed in previous versions of sys-libs/glibc, for |
| 54 |
which we have not issued a GLSA before. |
| 55 |
|
| 56 |
Impact |
| 57 |
====== |
| 58 |
|
| 59 |
A remote attacker could exploit any application which performs host |
| 60 |
name resolution using getaddrinfo() in order to execute arbitrary code |
| 61 |
or crash the application. The other vulnerabilities can possibly be |
| 62 |
exploited to cause a Denial of Service or leak information. |
| 63 |
|
| 64 |
Workaround |
| 65 |
========== |
| 66 |
|
| 67 |
A number of mitigating factors for CVE-2015-7547 have been identified. |
| 68 |
Please review the upstream advisory and references below. |
| 69 |
|
| 70 |
Resolution |
| 71 |
========== |
| 72 |
|
| 73 |
All GNU C Library users should upgrade to the latest version: |
| 74 |
|
| 75 |
# emerge --sync |
| 76 |
# emerge --ask --oneshot --verbose ">=sys-libs/glibc-2.21-r2" |
| 77 |
|
| 78 |
It is important to ensure that no running process uses the old glibc |
| 79 |
anymore. The easiest way to achieve that is by rebooting the machine |
| 80 |
after updating the sys-libs/glibc package. |
| 81 |
|
| 82 |
Note: Should you run into compilation failures while updating, please |
| 83 |
see bug 574948. |
| 84 |
|
| 85 |
References |
| 86 |
========== |
| 87 |
|
| 88 |
[ 1 ] CVE-2013-7423 |
| 89 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2013-7423 |
| 90 |
[ 2 ] CVE-2014-0475 |
| 91 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-0475 |
| 92 |
[ 3 ] CVE-2014-0475 |
| 93 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-0475 |
| 94 |
[ 4 ] CVE-2014-5119 |
| 95 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-5119 |
| 96 |
[ 5 ] CVE-2014-6040 |
| 97 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-6040 |
| 98 |
[ 6 ] CVE-2014-7817 |
| 99 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-7817 |
| 100 |
[ 7 ] CVE-2014-8121 |
| 101 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-8121 |
| 102 |
[ 8 ] CVE-2014-9402 |
| 103 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-9402 |
| 104 |
[ 9 ] CVE-2015-1472 |
| 105 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-1472 |
| 106 |
[ 10 ] CVE-2015-1781 |
| 107 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-1781 |
| 108 |
[ 11 ] CVE-2015-7547 |
| 109 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-7547 |
| 110 |
[ 12 ] CVE-2015-8776 |
| 111 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-8776 |
| 112 |
[ 13 ] CVE-2015-8778 |
| 113 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-8778 |
| 114 |
[ 14 ] CVE-2015-8779 |
| 115 |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-8779 |
| 116 |
[ 15 ] Google Online Security Blog: "CVE-2015-7547: glibc getaddrinfo |
| 117 |
stack-based buffer overflow" |
| 118 |
|
| 119 |
https://googleonlinesecurity.blogspot.de/2016/02/cve-2015-7547-glibc-getaddrinfo-stack.html |
| 120 |
|
| 121 |
Availability |
| 122 |
============ |
| 123 |
|
| 124 |
This GLSA and any updates to it are available for viewing at |
| 125 |
the Gentoo Security Website: |
| 126 |
|
| 127 |
https://security.gentoo.org/glsa/201602-02 |
| 128 |
|
| 129 |
Concerns? |
| 130 |
========= |
| 131 |
|
| 132 |
Security is a primary focus of Gentoo Linux and ensuring the |
| 133 |
confidentiality and security of our users' machines is of utmost |
| 134 |
importance to us. Any security concerns should be addressed to |
| 135 |
security@g.o or alternatively, you may file a bug at |
| 136 |
https://bugs.gentoo.org. |
| 137 |
|
| 138 |
License |
| 139 |
======= |
| 140 |
|
| 141 |
Copyright 2016 Gentoo Foundation, Inc; referenced text |
| 142 |
belongs to its owner(s). |
| 143 |
|
| 144 |
The contents of this document are licensed under the |
| 145 |
Creative Commons - Attribution / Share Alike license. |
| 146 |
|
| 147 |
http://creativecommons.org/licenses/by-sa/2.5 |
Archives