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[wlug] Fwd: [NZLUG] Fwd: [SECURITY] [DSA 3481-1] glibc security update

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Peter Reutemann fracpete@w...
Thu Feb 18 13:52:35 NZDT 2016

Apologies for cross-posting...

Cheers, Peter

---------- Forwarded message ----------
From: Mark Foster <blakjak@b...>
Date: Thu, Feb 18, 2016 at 1:50 PM
Subject: Re: [NZLUG] Fwd: [SECURITY] [DSA 3481-1] glibc security update
To: NZ Linux Users Group <nzlug@l...>

And just to illustrate that, CERT is compiling a list of vendor's
position statements etc, it's quite a list already:

On 18/02/2016 1:49 p.m., Mark Foster wrote:

This is a widespread risk to pretty much every linux based system out
there. I hope you're all aware of this one and taking action to patch
or protect your systems.

-------- Forwarded Message --------
Subject: [SECURITY] [DSA 3481-1] glibc security update
Resent-Date: Tue, 16 Feb 2016 14:18:54 +0000 (UTC)
Resent-From: debian-security-announce@l...
Date: Tue, 16 Feb 2016 14:18:27 +0000
From: Salvatore Bonaccorso <carnil@d...>
Reply-To: debian-security@l...
To: debian-security-announce@l...

Hash: SHA512

- -------------------------------------------------------------------------
Debian Security Advisory DSA-3481-1                   security@d...                           Florian Weimer
February 16, 2016           
- -------------------------------------------------------------------------

Package        : glibc
CVE ID         : CVE-2015-7547 CVE-2015-8776 CVE-2015-8778 CVE-2015-8779
Debian Bug     : 812441 812445 812455

Several vulnerabilities have been fixed in the GNU C Library, glibc.

The first vulnerability listed below is considered to have critical


    The Google Security Team and Red Hat discovered that the glibc
    host name resolver function, getaddrinfo, when processing
    AF_UNSPEC queries (for dual A/AAAA lookups), could mismanage its
    internal buffers, leading to a stack-based buffer overflow and
    arbitrary code execution.  This vulnerability affects most
    applications which perform host name resolution using getaddrinfo,
    including system services.


    Adam Nielsen discovered that if an invalid separated time value
    is passed to strftime, the strftime function could crash or leak
    information.  Applications normally pass only valid time
    information to strftime; no affected applications are known.


    Szabolcs Nagy reported that the rarely-used hcreate and hcreate_r
    functions did not check the size argument properly, leading to a
    crash (denial of service) for certain arguments.  No impacted
    applications are known at this time.


    The catopen function contains several unbound stack allocations
    (stack overflows), causing it the crash the process (denial of
    service).  No applications where this issue has a security impact
    are currently known.

While it is only necessary to ensure that all processes are not using
the old glibc anymore, it is recommended to reboot the machines after
applying the security upgrade.

For the stable distribution (jessie), these problems have been fixed in
version 2.19-18+deb8u3.

For the unstable distribution (sid), these problems will be fixed in
version 2.21-8.

We recommend that you upgrade your glibc packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:

Mailing list: debian-security-announce@l...
Version: GnuPG v1


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Peter Reutemann
Dept. of Computer Science
University of Waikato, NZ
+64 (7) 858-5174

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