Severity

Medium

Vendor

Canonical Ubuntu

Versions Affected

• Canonical Ubuntu 14.04

Description

USN-3239-1 fixed vulnerabilities in the GNU C Library. Unfortunately, the fix for CVE-2015-5180 introduced an internal ABI change within the resolver library.

Original advisory details:

It was discovered that the GNU C Library incorrectly handled the strxfrm() function. An attacker could use this issue to cause a denial of service or possibly execute arbitrary code. (CVE-2015-8982)

It was discovered that an integer overflow existed in the _IO_wstr_overflow() function of the GNU C Library. An attacker could use this to cause a denial of service or possibly execute arbitrary code. (CVE-2015-8983)

It was discovered that the fnmatch() function in the GNU C Library did not properly handle certain malformed patterns. An attacker could use this to cause a denial of service. (CVE-2015-8984)

Alexander Cherepanov discovered a stack-based buffer overflow in the glob implementation of the GNU C Library. An attacker could use this to specially craft a directory layout and cause a denial of service. (CVE-2016-1234)

Florian Weimer discovered a NULL pointer dereference in the DNS resolver of the GNU C Library. An attacker could use this to cause a denial of service. (CVE-2015-5180)

Michael Petlan discovered an unbounded stack allocation in the getaddrinfo() function of the GNU C Library. An attacker could use this to cause a denial of service. (CVE-2016-3706)

Aldy Hernandez discovered an unbounded stack allocation in the sunrpc implementation in the GNU C Library. An attacker could use this to cause a denial of service. (CVE-2016-4429)

Tim Ruehsen discovered that the getaddrinfo() implementation in the GNU C Library did not properly track memory allocations. An attacker could use this to cause a denial of service. This issue only affected Ubuntu 16.04 LTS. (CVE-2016-5417)

Andreas Schwab discovered that the GNU C Library on ARM 32-bit platforms did not properly set up execution contexts. An attacker could use this to cause a denial of service. (CVE-2016-6323)

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

• Cloud Foundry BOSH stemcells are vulnerable, including:
  • 3151.x versions prior to 3151.14
  • 3233.x versions prior to 3233.16
  • 3263.x versions prior to 3263.22
  • 3312.x versions prior to 3312.22
  • 3363.x versions prior to 3363.14
  • All other stemcells not listed.
• All versions of Cloud Foundry cflinuxfs2 prior to 1.111.0

Mitigation

OSS users are strongly encouraged to follow one of the mitigations below:

• The Cloud Foundry project recommends upgrading the following BOSH stemcells:
  • Upgrade 3151.x versions to 3151.14 or later
  • Upgrade 3233.x versions to 3233.16 or later
  • Upgrade 3263.x versions to 3263.22 or later
  • Upgrade 3312.x versions to 3312.22 or later
  • Upgrade 3363.x versions to 3363.14 or later
  • All other stemcells should be upgraded to the latest version.
• The Cloud Foundry project recommends that Cloud Foundry deployments run with cflinuxfs2 versions 1.111.0 or later.

References

• USN-3239-2
• CVE-2015-5180
• CVE-2015-8982
• CVE-2015-8983
• CVE-2015-8984
• CVE-2016-1234
• CVE-2016-3706
• CVE-2016-4429
• CVE-2016-5417
• CVE-2016-6323