Apple tvOS up to 10.2.2 libexpat xml external entity reference

CVSS Meta Temp Score
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in Apple tvOS up to 10.2.2. The affected element is an unknown function of the component libexpat. Such manipulation leads to xml external entity reference. This vulnerability is listed as CVE-2017-9233. The attack may be performed from remote. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Apple tvOS up to 10.2.2 (Digital Media Player). Affected by this issue is some unknown functionality of the component libexpat. 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. CVE summarizes:

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 presented 09/25/2017 by Rhodri James as HT208113 as confirmed advisory (Website). The advisory is shared for download at support.apple.com. This vulnerability is handled as CVE-2017-9233 since 05/26/2017. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The advisory points out:

Multiple issues were addressed by updating to version 2.2.1

The vulnerability was handled as a non-public zero-day exploit for at least 37 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 109594 (FreeBSD : python 2.7 -- multiple vulnerabilities (8719b935-8bae-41ad-92ba-3c826f651219)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD 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 to version 11.0 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (109594) and SecurityFocus (BID 99276†). See VDB-89749, VDB-90431, VDB-99039 and VDB-104507 for similar entries. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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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: 109594
Nessus Name: FreeBSD : python 2.7 -- multiple vulnerabilities (8719b935-8bae-41ad-92ba-3c826f651219)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 801105
OpenVAS Name: Apple Mac OS X Multiple Vulnerabilities-HT208144
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: tvOS 11.0

Timelineinfo

05/26/2017 🔍
06/18/2017 +23 days 🔍
06/26/2017 +8 days 🔍
07/25/2017 +29 days 🔍
09/25/2017 +62 days 🔍
09/25/2017 +0 days 🔍
10/23/2017 +28 days 🔍
05/07/2018 +196 days 🔍
01/20/2021 +989 days 🔍

Sourcesinfo

Vendor: apple.com

Advisory: HT208113
Researcher: Rhodri James
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-9233 (🔍)
GCVE (CVE): GCVE-0-2017-9233
GCVE (VulDB): GCVE-100-108488

OVAL: 🔍

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

See also: 🔍

Entryinfo

Created: 10/23/2017 11:51
Updated: 01/20/2021 09:20
Changes: 10/23/2017 11:51 (69), 11/29/2019 17:32 (17), 01/20/2021 09:20 (3)
Complete: 🔍
Cache ID: 216::103

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