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centosCentOS ProjectCESA-2016:0175
HistoryFeb 17, 2016 - 12:39 a.m.

glibc, nscd security update

2016-02-1700:39:19
CentOS Project
lists.centos.org
94

8.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

6.8 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:P/I:P/A:P

0.974 High

EPSS

Percentile

99.9%

CentOS Errata and Security Advisory CESA-2016:0175

The glibc packages provide the standard C libraries (libc), POSIX thread
libraries (libpthread), standard math libraries (libm), and the Name
Server Caching Daemon (nscd) used by multiple programs on the system.
Without these libraries, the Linux system cannot function correctly.

A stack-based buffer overflow was found in the way the libresolv library
performed dual A/AAAA DNS queries. A remote attacker could create a
specially crafted DNS response which could cause libresolv to crash or,
potentially, execute code with the permissions of the user running the
library. Note: this issue is only exposed when libresolv is called from the
nss_dns NSS service module. (CVE-2015-7547)

This issue was discovered by the Google Security Team and Red Hat.

This update also fixes the following bugs:

  • The dynamic loader has been enhanced to allow the loading of more shared
    libraries that make use of static thread local storage. While static thread
    local storage is the fastest access mechanism it may also prevent the
    shared library from being loaded at all since the static storage space is a
    limited and shared process-global resource. Applications which would
    previously fail with “dlopen: cannot load any more object with static TLS”
    should now start up correctly. (BZ#1291270)

  • A bug in the POSIX realtime support would cause asynchronous I/O or
    certain timer API calls to fail and return errors in the presence of large
    thread-local storage data that exceeded PTHREAD_STACK_MIN in size
    (generally 16 KiB). The bug in librt has been corrected and the impacted
    APIs no longer return errors when large thread-local storage data is
    present in the application. (BZ#1301625)

All glibc users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2016-February/083830.html

Affected packages:
glibc
glibc-common
glibc-devel
glibc-headers
glibc-static
glibc-utils
nscd

Upstream details at:
https://access.redhat.com/errata/RHSA-2016:0175

8.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

6.8 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:P/I:P/A:P

0.974 High

EPSS

Percentile

99.9%