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Ubuntu: (Multiple Advisories) (CVE-2016-2856): GNU C Library regression

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Ubuntu: (Multiple Advisories) (CVE-2016-2856): GNU C Library regression

Severity
7
CVSS
(AV:L/AC:L/Au:N/C:C/I:C/A:C)
Published
03/13/2016
Created
07/25/2018
Added
05/27/2016
Modified
04/25/2018

Description

pt_chown in the glibc package before 2.19-18+deb8u4 on Debian jessie; the elibc package before 2.15-0ubuntu10.14 on Ubuntu 12.04 LTS and before 2.19-0ubuntu6.8 on Ubuntu 14.04 LTS; and the glibc package before 2.21-0ubuntu4.2 on Ubuntu 15.10 and before 2.23-0ubuntu1 on Ubuntu 16.04 LTS and 16.10 lacks a namespace check associated with file-descriptor passing, which allows local users to capture keystrokes and spoof data, and possibly gain privileges, via pts read and write operations, related to debian/sysdeps/linux.mk. NOTE: this is not considered a vulnerability in the upstream GNU C Library because the upstream documentation has a clear security recommendation against the --enable-pt_chown option.

Solution(s)

  • ubuntu-upgrade-libc-bin
  • ubuntu-upgrade-libc6
  • ubuntu-upgrade-libc6-dev

References

  • USN-2985-1
  • USN-2985-2
  • 84601
  • CVE-2016-2856

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