Scientific Linux Security Update : glibc on SL6.x i386/x86_64

This script is Copyright (C) 2013 Tenable Network Security, Inc.


Synopsis :

The remote Scientific Linux host is missing one or more security
updates.

Description :

Multiple integer overflow flaws, leading to heap-based buffer
overflows, were found in glibc's memory allocator functions (pvalloc,
valloc, and memalign). If an application used such a function, it
could cause the application to crash or, potentially, execute
arbitrary code with the privileges of the user running the
application. (CVE-2013-4332)

A flaw was found in the regular expression matching routines that
process multibyte character input. If an application utilized the
glibc regular expression matching mechanism, an attacker could provide
specially-crafted input that, when processed, would cause the
application to crash. (CVE-2013-0242)

It was found that getaddrinfo() did not limit the amount of stack
memory used during name resolution. An attacker able to make an
application resolve an attacker-controlled hostname or IP address
could possibly cause the application to exhaust all stack memory and
crash. (CVE-2013-1914)

Among other changes, this update includes an important fix for the
following bug :

- Due to a defect in the initial release of the
getaddrinfo() system call in Scientific Linux 6.0,
AF_INET and AF_INET6 queries resolved from the
/etc/hosts file returned queried names as canonical
names. This incorrect behavior is, however, still
considered to be the expected behavior. As a result of a
recent change in getaddrinfo(), AF_INET6 queries started
resolving the canonical names correctly. However, this
behavior was unexpected by applications that relied on
queries resolved from the /etc/hosts file, and these
applications could thus fail to operate properly. This
update applies a fix ensuring that AF_INET6 queries
resolved from /etc/hosts always return the queried name
as canonical. Note that DNS lookups are resolved
properly and always return the correct canonical names.
A proper fix to AF_INET6 queries resolution from
/etc/hosts may be applied in future releases
for now,
due to a lack of standard, Red Hat suggests the first
entry in the /etc/hosts file, that applies for the IP
address being resolved, to be considered the canonical
entry.

See also :

http://www.nessus.org/u?030c8ddc

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P)

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 71193 ()

Bugtraq ID:

CVE ID: CVE-2013-0242
CVE-2013-1914
CVE-2013-4332