Bug 1300594 – CVE-2016-1572 ecryptfs-utils: privilege escalation by mounting over /proc/$pid

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Bug 1300594 - (CVE-2016-1572) CVE-2016-1572 ecryptfs-utils: privilege escalation by mounting over /proc/$pid

Summary:	CVE-2016-1572 ecryptfs-utils: privilege escalation by mounting over /proc/$pid

Status:	CLOSED NOTABUG

Aliases:	CVE-2016-1572

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	high Severity high
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=important,public=20160120,repo...
Keywords:	Security

Depends On:	1300595
Blocks:	1300590
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Reported:	2016-01-21 04:15 EST by Andrej Nemec
Modified:	2016-02-23 11:54 EST (History)
CC List:	3 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2016-02-23 11:54:14 EST
Type:	---
Regression:	---
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Documentation:	---
CRM:
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oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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Description Andrej Nemec 2016-01-21 04:15:50 EST

An unprivileged user can mount an ecryptfs over /proc/$pid because according to stat(), it is a normal directory and owned by the user. However, the user is not actually permitted to create arbitrary directory entries in /proc/$pid, and ecryptfs' behavior might be enabling privilege escalation attacks with the help of other programs that use procfs.

Upstream bug report with reproducer:

https://bugs.launchpad.net/ecryptfs/+bug/1530566

Proposed upstream patch:

https://bazaar.launchpad.net/~ecryptfs/ecryptfs/trunk/revision/870

Comment 1 Andrej Nemec 2016-01-21 04:16:14 EST

Created ecryptfs-utils tracking bugs for this issue:

Affects: fedora-all [bug 1300595]

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