Ruby 1.8.6/1.8.7/1.9 REXML input validation

CVSS Meta Temp Score
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CTI Interest Score
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6.5$0-$5k0.00

A vulnerability, which was classified as critical, was found in Ruby 1.8.6/1.8.7/1.9 (Programming Language Software). Affected is the function REXML. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. CVE summarizes:

The REXML module in Ruby 1.8.6 through 1.8.6-p287, 1.8.7 through 1.8.7-p72, and 1.9 allows context-dependent attackers to cause a denial of service (CPU consumption) via an XML document with recursively nested entities, aka an "XML entity explosion."

The bug was discovered 08/23/2008. The weakness was published 08/25/2008 by Luka Treiber Mitka Kolsek with ACROS Security (Website). The advisory is available at ruby-lang.org. This vulnerability is traded as CVE-2008-3790 since 08/26/2008. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details and a public exploit are known.

A public exploit has been developed in XML. The exploit is shared for download at securityfocus.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 43122 (Fedora 10 : ruby-1.8.6.368-2.fc10 (2009-13066)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 165649 (SUSE Enterprise Linux Security Update dhcp-client (SUSE-SA:2009:037)).

Upgrading eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at ruby-lang.org. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published 2 years after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (44628) and Tenable (43122). Similar entries are available at 43706, 43674, 43673 and 43672.

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CPE 2.3info

CPE 2.2info

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CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 6.5

VulDB Base Score: 7.5
VulDB Temp Score: 6.5
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CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

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

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Programming Language: 🔍
Download: 🔍

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Nessus ID: 43122
Nessus Name: Fedora 10 : ruby-1.8.6.368-2.fc10 (2009-13066)
Nessus File: 🔍
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Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 61773
OpenVAS Name: Debian Security Advisory DSA 1651-1 (ruby1.8)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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Patch: ruby-lang.org

Timelineinfo

08/23/2008 🔍
08/23/2008 +0 days 🔍
08/23/2008 +0 days 🔍
08/25/2008 +2 days 🔍
08/25/2008 +0 days 🔍
08/25/2008 +0 days 🔍
08/26/2008 +0 days 🔍
08/27/2008 +1 days 🔍
09/19/2008 +23 days 🔍
10/12/2008 +23 days 🔍
12/11/2009 +425 days 🔍
12/14/2009 +3 days 🔍
08/18/2019 +3534 days 🔍

Sourcesinfo

Advisory: ruby-lang.org
Researcher: Luka Treiber Mitka Kolsek
Organization: ACROS Security
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2008-3790 (🔍)
OVAL: 🔍

X-Force: 44628 - Ruby REXML library denial of service, Medium Risk
SecurityTracker: 1020735
Vulnerability Center: 19680 - Ruby REXML Module Remote DoS via an XML Document, Medium
SecurityFocus: 30802 - Ruby REXML Remote Denial Of Service Vulnerability
Secunia: 31602
OSVDB: 47753 - Ruby REXML Library Crafted XML Document Handling DoS
Vupen: ADV-2008-2483

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 09/19/2008 11:47
Updated: 08/18/2019 09:08
Changes: 09/19/2008 11:47 (103), 08/18/2019 09:08 (2)
Complete: 🔍
Cache ID: 18:779

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