National Vulnerability Database (NVD) National Vulnerability Database (CVE-2007-4849)

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Last updated: Tue Aug 25 20:00:36 EDT 2009

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Vulnerability Summary for CVE-2007-4849

Original release date:09/12/2007

Last revised:09/05/2008

Source: US-CERT/NIST

Overview

JFFS2, as used on One Laptop Per Child (OLPC) build 542 and possibly other Linux systems, when POSIX ACL support is enabled, does not properly store permissions during (1) inode creation or (2) ACL setting, which might allow local users to access restricted files or directories after a remount of a filesystem, related to "legacy modes" and an inconsistency between dentry permissions and inode permissions.

Impact

CVSS Severity (version 2.0):

CVSS v2 Base Score:4.4 (MEDIUM) (AV:L/AC:M/Au:N/C:P/I:P/A:P) (legend)

Impact Subscore: 6.4

Exploitability Subscore: 3.4

CVSS Version 2 Metrics:

Access Vector: Locally exploitable

Access Complexity: Medium

Authentication: Not required to exploit

Impact Type:Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service

Vendor Statments (disclaimer)

Official Statement from Red Hat (10/10/2007): Not vulnerable. There is no support for jffs2 in the Linux kernel as distributed with Red Hat Enterprise Linux 2.1 or 3. There is no ACL support for jffs2 in the Linux kernel as distributed with Red Hat Enterprise Linux 4 or 5.

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External Source: MLIST

Name: [linux-mtd] 20070822 [JFFS2] Fix ACL vs. mode handling.

Hyperlink:http://lists.infradead.org/pipermail/linux-mtd-cvs/2007-August/005897.html

External Source: CONFIRM

Name: http://git.infradead.org/?p=mtd-2.6.git;a=commitdiff;h=9ed437c50d89eabae763dd422579f73fdebf288d

Hyperlink:http://git.infradead.org/?p=mtd-2.6.git;a=commitdiff;h=9ed437c50d89eabae763dd422579f73fdebf288d

External Source: CONFIRM

Name: http://dev.laptop.org/ticket/2732

Hyperlink:http://dev.laptop.org/ticket/2732

External Source: UBUNTU

Name: USN-574-1

Hyperlink:http://www.ubuntu.com/usn/usn-574-1