Linux Foundation Xen 3.0.3 pygrub input validation

CVSS Meta Temp Score
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CTI Interest Score
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4.0$0-$5k0.00

A vulnerability was found in Linux Foundation Xen 3.0.3 (Virtualization Software). It has been rated as problematic. Affected by this issue is some unknown processing of the component pygrub. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, and integrity. CVE summarizes:

pygrub (tools/pygrub/src/GrubConf.py) in Xen 3.0.3, when booting a guest domain, allows local users with elevated privileges in the guest domain to execute arbitrary commands in domain 0 via a crafted grub.conf file whose contents are used in exec statements.

The bug was discovered 09/22/2007. The weakness was presented 09/27/2007 by Joris van Rantwijk as 1068 as not defined bug report (Bugzilla). The advisory is available at bugzilla.xensource.com. This vulnerability is handled as CVE-2007-4993 since 09/20/2007. Access to the local network is required for this attack to succeed. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 07/27/2019).

It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 5 days. During that time the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 28132 (Ubuntu 7.04 : xen-3.0 vulnerability (USN-527-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 156021 (Oracle Enterprise Linux Update for xen (ELSA-2007-0323)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at bugzilla.xensource.com. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (36835) and Tenable (28132). See VDB-39486 for similar entry.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.2
VulDB Meta Temp Score: 4.0

VulDB Base Score: 4.2
VulDB Temp Score: 4.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Partially

Availability: 🔍
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 28132
Nessus Name: Ubuntu 7.04 : xen-3.0 vulnerability (USN-527-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 58643
OpenVAS Name: Debian Security Advisory DSA 1384-1 (xen-utils)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Disable
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: bugzilla.xensource.com

Timelineinfo

09/20/2007 🔍
09/22/2007 +2 days 🔍
09/22/2007 +0 days 🔍
09/22/2007 +0 days 🔍
09/27/2007 +5 days 🔍
09/27/2007 +0 days 🔍
09/27/2007 +0 days 🔍
10/01/2007 +3 days 🔍
10/08/2007 +7 days 🔍
10/09/2007 +1 days 🔍
10/10/2007 +1 days 🔍
11/10/2007 +31 days 🔍
07/27/2019 +4277 days 🔍

Sourcesinfo

Vendor: linuxfoundation.org

Advisory: 1068
Researcher: Joris van Rantwijk
Status: Not defined
Confirmation: 🔍

CVE: CVE-2007-4993 (🔍)
OVAL: 🔍

X-Force: 36835
Vulnerability Center: 16273 - Xen Pygrub Vulnerability Allows Local Users to Execute Arbitrary Commands, High
SecurityFocus: 25825 - Xen pygrub TOOLS/PYGRUB/SRC/GRUBCONF.PY Local Command Injection Vulnerability
Secunia: 27161
OSVDB: 41340 - Xen pygrub (tools/pygrub/src/GrubConf.py) Cross-Domain Arbitrary Command Execution
Vupen: ADV-2007-3348

See also: 🔍

Entryinfo

Created: 10/01/2007 15:25
Updated: 07/27/2019 10:05
Changes: 10/01/2007 15:25 (97), 07/27/2019 10:05 (1)
Complete: 🔍
Cache ID: 18:74C:103

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