Ubuntu alert USN-4954-1 (glibc)

From:
             
 
Steve Beattie <steve.beattie@canonical.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-4954-1] GNU C Library vulnerabilities
Date:
             
 
Thu, 13 May 2021 17:43:57 -0700
Message-ID:
             
 
<YJ3HzSIXjHHQkzgN@nxnw.org>
==========================================================================
Ubuntu Security Notice USN-4954-1
May 14, 2021

glibc vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in GNU C Library.

Software Description:
- glibc: GNU C Library

Details:

Jason Royes and Samuel Dytrych discovered that the memcpy()
implementation for 32 bit ARM processors in the GNU C Library contained
an integer underflow vulnerability. An attacker could possibly use
this to cause a denial of service (application crash) or execute
arbitrary code. (CVE-2020-6096)

It was discovered that the POSIX regex implementation in the GNU C
Library did not properly parse alternatives. An attacker could use this
to cause a denial of service. (CVE-2009-5155)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.04 LTS:
  libc6                           2.23-0ubuntu11.3

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-4954-1
  CVE-2009-5155, CVE-2020-6096

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