National Cyber-Alert System
Vulnerability Summary for CVE-2007-2453
Original release date:06/11/2007
Last revised:09/05/2008
Source:
US-CERT/NIST
Overview
The random number feature in Linux kernel 2.6 before 2.6.20.13, and 2.6.21.x before 2.6.21.4, (1) does not properly seed pools when there is no entropy, or (2) uses an incorrect cast when extracting entropy, which might cause the random number generator to provide the same values after reboots on systems without an entropy source.
Impact
CVSS Severity (version 2.0):
Impact Subscore:
2.9
Exploitability Subscore:
1.9
CVSS Version 2 Metrics:
Access Vector: Locally exploitable
Access Complexity: High
Authentication: Not required to exploit
Impact Type:Allows unauthorized disclosure of information
- Official Statement from Red Hat (06/12/2007)
-
This issue did not affect the versions of the the Linux kernel supplied with Red Hat Enterprise Linux 2.1, 3, or 4.
For systems based on Red Hat Enterprise Linux 5, this is only an issue for systems without a real time clock, harddrive activity, or user input during boot time. Red Hat is aware of this issue and is tracking it via the following bug: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=241718
The Red Hat Security Response Team has rated this issue as having low security impact, a future update may address this flaw. More information regarding issue severity can be found here: http://www.redhat.com/security/updates/classification/
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving NIST webspace. We have provided these links to other web sites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other web sites that are more appropriate for your purpose. NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, NIST does not endorse any commercial products that may be mentioned on these sites. Please address comments about this page to nvd@nist.gov.
External Source: MLIST
Name: [linux-kernel] 20070608 Linux 2.6.21.4
Type: Patch Information
External Source: MLIST
Name: [linux-kernel] 20070608 Linux 2.6.20.13
Type: Patch Information
External Source: CONFIRM
Name: http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.21.4
External Source: REDHAT
Name: RHSA-2007:0376
External Source: XF
Name: kernel-randomnumber-weak-security(34781)
External Source: UBUNTU
Name: USN-489-1
External Source: UBUNTU
Name: USN-486-1
External Source: UBUNTU
Name: USN-470-1
External Source: SECTRACK
Name: 1018248
External Source: BID
Name: 24390
External Source: SUSE
Name: SUSE-SA:2007:051
External Source: SUSE
Name: SUSE-SA:2007:043
External Source: MANDRIVA
Name: MDKSA-2007:216
External Source: MANDRIVA
Name: MDKSA-2007:196
External Source: MANDRIVA
Name: MDKSA-2007:171
External Source: VUPEN
Name: ADV-2007-2105
External Source: DEBIAN
Name: DSA-1356
External Source: SECUNIA
Name: 26664
External Source: SECUNIA
Name: 26620
External Source: SECUNIA
Name: 26450
External Source: SECUNIA
Name: 26139
External Source: SECUNIA
Name: 26133
External Source: SECUNIA
Name: 25961
External Source: SECUNIA
Name: 25700
External Source: SECUNIA
Name: 25596
