Bug 1259222 (CVE-2015-7509)

Summary:	CVE-2015-7509 kernel: Mounting ext2 fs e2fsprogs/tests/f_orphan as ext4 crashes system
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	agordeev, aquini, bhu, dhoward, esammons, fhrbata, iboverma, jkacur, joelsmith, jross, jrusnack, kernel-mgr, lgoncalv, lwang, matt, mcressma, mguzik, nmurray, pholasek, plougher, ppandit, qguo, rvrbovsk, security-response-team, slong, vdronov, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	A flaw was found in the way the Linux kernel's ext4 file system driver handled non-journal file systems with an orphan list. An attacker with physical access to the system could use this flaw to crash the system or, although unlikely, escalate their privileges on the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-11-24 12:04:15 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1259123
Bug Blocks:	1259228

Description Adam Mariš 2015-09-02 08:55:59 UTC

A vulnerability was found when mounting the ext2 filesystem from e2fsprogs/tests/f_orphan as ext4, leading to system crash.

Original report:

https://bugzilla.redhat.com/show_bug.cgi?id=1259123

Comment 3 Vladis Dronov 2015-11-24 12:00:18 UTC

Upstream Linux kernel patches fixing the issue:

c9b92530 ext4: make orphan functions be no-op in no-journal mode
0e9a9a1a ext4: avoid hang when mounting non-journal filesystems with orphan list

Comment 4 Vladis Dronov 2015-11-24 12:04:15 UTC

Statement:

This problem did not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG-2. This issue is not planned to be corrected in future updates for Red Hat Enterprise Linux 5.

This issue is rated low as exploiting it requires physical (to plug in specially prepared usb disk) or root (to mount specially prepared filesystem) access to the system. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely.

Comment 6 errata-xmlrpc 2016-05-10 23:11:24 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2016:0855 https://rhn.redhat.com/errata/RHSA-2016-0855.html