Bug 1295287 - (CVE-2015-8709) CVE-2015-8709 Kernel: ptrace: potential privilege escalation in user namespaces
CVE-2015-8709 Kernel: ptrace: potential privilege escalation in user namespaces
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
impact=important,public=20151212,repo...
: Security
Depends On: 1295288
Blocks: 1295281
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Reported: 2016-01-04 01:14 EST by Prasad J Pandit
Modified: 2016-10-04 00:20 EDT (History)
33 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
A privilege-escalation vulnerability was discovered in the Linux kernel built with User Namespace (CONFIG_USER_NS) support. The flaw occurred when the ptrace() system call was used on a root-owned process to enter a user namespace. A privileged namespace user could exploit this flaw to potentially escalate their privileges on the system, outside the original namespace.
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Description Prasad J Pandit 2016-01-04 01:14:01 EST
Linux kernel built with the User Namespaces(CONFIG_USER_NS) support is
vulnerable to a potential privilege escalation flaw. It could occur when a
root owned process tries to enter a user namespace, wherein a user attempts
to attach the entering process via ptrace(1).

A privileged name space user could use this flaw to potentially escalate their
privileges on the system.

Upstream fix:
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  -> https://lkml.org/lkml/2015/12/25/71

Reference:
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  -> http://seclists.org/oss-sec/2015/q4/614
Comment 1 Prasad J Pandit 2016-01-04 01:15:16 EST
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1295288]
Comment 2 Prasad J Pandit 2016-01-04 05:41:42 EST
Statement:

This issue does not affect the versions of the kernel package as shipped with
Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2.
Comment 4 Fedora Update System 2016-01-12 02:59:25 EST
kernel-4.3.3-300.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
Comment 5 Fedora Update System 2016-02-01 01:23:43 EST
kernel-4.3.4-200.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

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