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.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Ubuntu_linux | Canonical | 12.04 (including) | 12.04 (including) |
| Ubuntu_linux | Canonical | 14.04 (including) | 14.04 (including) |
| Ubuntu_linux | Canonical | 15.10 (including) | 15.10 (including) |
| Eglibc | Ubuntu | esm-infra-legacy/trusty | * |
| Eglibc | Ubuntu | precise | * |
| Eglibc | Ubuntu | trusty | * |
| Eglibc | Ubuntu | trusty/esm | * |
| Glibc | Ubuntu | vivid/stable-phone-overlay | * |
| Glibc | Ubuntu | vivid/ubuntu-core | * |
| Glibc | Ubuntu | wily | * |
References
- http://anonscm.debian.org/cgit/pkg-glibc/glibc.git/commit/?h=jessie\u0026id=09f7764882a81e13e7b5d87d715412283a6ce403
- http://anonscm.debian.org/cgit/pkg-glibc/glibc.git/commit/?h=jessie\u0026id=11475c083282c1582c4dd72eecfcb2b7d308c958
- http://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-2856.html
- http://www.halfdog.net/Security/2015/PtChownArbitraryPtsAccessViaUserNamespace/
- http://www.openwall.com/lists/oss-security/2016/02/23/3
- http://www.openwall.com/lists/oss-security/2016/03/07/2
- http://www.securityfocus.com/bid/84601
- http://www.ubuntu.com/usn/USN-2985-1
- http://www.ubuntu.com/usn/USN-2985-2
- http://anonscm.debian.org/cgit/pkg-glibc/glibc.git/commit/?h=jessie\u0026id=09f7764882a81e13e7b5d87d715412283a6ce403
- http://anonscm.debian.org/cgit/pkg-glibc/glibc.git/commit/?h=jessie\u0026id=11475c083282c1582c4dd72eecfcb2b7d308c958
- http://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-2856.html
- http://www.halfdog.net/Security/2015/PtChownArbitraryPtsAccessViaUserNamespace/
- http://www.openwall.com/lists/oss-security/2016/02/23/3
- http://www.openwall.com/lists/oss-security/2016/03/07/2
- http://www.securityfocus.com/bid/84601
- http://www.ubuntu.com/usn/USN-2985-1
- http://www.ubuntu.com/usn/USN-2985-2