libexpat up to 2.2.0 xml external entity reference

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in libexpat up to 2.2.0. The impacted element is an unknown function. The manipulation leads to xml external entity reference. This vulnerability is uniquely identified as CVE-2017-9233. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in libexpat up to 2.2.0. It has been rated as problematic. This issue affects an unknown code. The manipulation with an unknown input leads to a xml external entity reference vulnerability. Using CWE to declare the problem leads to CWE-611. The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output. Impacted is availability. The summary by CVE is:

XML External Entity vulnerability in libexpat 2.2.0 and earlier (Expat XML Parser Library) allows attackers to put the parser in an infinite loop using a malformed external entity definition from an external DTD.

The bug was discovered 06/18/2017. The weakness was disclosed 07/25/2017 by Rhodri James (oss-sec). It is possible to read the advisory at openwall.com. The identification of this vulnerability is CVE-2017-9233 since 05/26/2017. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 100850 (Debian DLA-990-1 : expat security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 170320 (SUSE Enterprise Linux Security Update for expat (SUSE-SU-2017:2299-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (100850) and SecurityFocus (BID 99276†). The entries VDB-108410, VDB-108471 and VDB-108488 are pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Xml external entity reference
CWE: CWE-611 / CWE-610
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 100850
Nessus Name: Debian DLA-990-1 : expat security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703898
OpenVAS Name: Debian Security Advisory DSA 3898-1 (expat - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

05/26/2017 🔍
06/17/2017 +22 days 🔍
06/18/2017 +1 days 🔍
06/19/2017 +1 days 🔍
06/26/2017 +7 days 🔍
07/25/2017 +29 days 🔍
07/25/2017 +0 days 🔍
07/26/2017 +1 days 🔍
12/14/2022 +1967 days 🔍

Sourcesinfo

Product: github.com

Advisory: K03244804
Researcher: Rhodri James
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-9233 (🔍)
GCVE (CVE): GCVE-0-2017-9233
GCVE (VulDB): GCVE-100-104507

OVAL: 🔍

SecurityFocus: 99276 - Expat CVE-2017-9233 XML External Entity Denial of Service Vulnerability
SecurityTracker: 1039427

See also: 🔍

Entryinfo

Created: 07/26/2017 18:14
Updated: 12/14/2022 08:32
Changes: 07/26/2017 18:14 (74), 11/01/2019 11:20 (3), 01/06/2021 13:11 (3), 12/14/2022 08:32 (2)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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