PHP up to 5.6.35/7.0.29/7.1.16/7.2.4 iconv Stream Filter ext/iconv/iconv.c resource consumption

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.3	$0-$5k	0.00

Summaryinfo

A vulnerability labeled as problematic has been found in PHP up to 5.6.35/7.0.29/7.1.16/7.2.4. Affected is an unknown function of the file ext/iconv/iconv.c of the component iconv Stream Filter. The manipulation results in resource consumption. This vulnerability is cataloged as CVE-2018-10546. The attack may be launched remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in PHP up to 5.6.35/7.0.29/7.1.16/7.2.4 (Programming Language Software). It has been classified as problematic. Affected is an unknown part of the file ext/iconv/iconv.c of the component iconv Stream Filter. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. CVE summarizes:

An issue was discovered in PHP before 5.6.36, 7.0.x before 7.0.30, 7.1.x before 7.1.17, and 7.2.x before 7.2.5. An infinite loop exists in ext/iconv/iconv.c because the iconv stream filter does not reject invalid multibyte sequences.

The bug was discovered 04/26/2018. The weakness was shared 04/29/2018 (Website). The advisory is shared for download at php.net. This vulnerability is traded as CVE-2018-10546 since 04/29/2018. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability was handled as a non-public zero-day exploit for at least 3 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 109878 (openSUSE Security Update : php5 (openSUSE-2018-465)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171128 (SUSE Enterprise Linux Security Update for php53 (SUSE-SU-2018:1294-1)).

Upgrading to version 5.6.36, 7.0.30, 7.1.17 or 7.2.5 eliminates this vulnerability. A possible mitigation has been published 3 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (109878) and SecurityFocus (BID 104019†). The entries VDB-67396, VDB-67398, VDB-67420 and VDB-67724 are related to this item. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Programming Language Software

Name

• PHP

Version

• 5.6.0
• 5.6.1
• 5.6.2
• 5.6.3
• 5.6.4
• 5.6.5
• 5.6.6
• 5.6.7
• 5.6.8
• 5.6.9
• 5.6.10
• 5.6.11
• 5.6.12
• 5.6.13
• 5.6.14
• 5.6.15
• 5.6.16
• 5.6.17
• 5.6.18
• 5.6.19
• 5.6.20
• 5.6.21
• 5.6.22
• 5.6.23
• 5.6.24
• 5.6.25
• 5.6.26
• 5.6.27
• 5.6.28
• 5.6.29
• 5.6.30
• 5.6.31
• 5.6.32
• 5.6.33
• 5.6.34
• 5.6.35
• 7.0.0
• 7.0.1
• 7.0.2
• 7.0.3
• 7.0.4
• 7.0.5
• 7.0.6
• 7.0.7
• 7.0.8
• 7.0.9
• 7.0.10
• 7.0.11
• 7.0.12
• 7.0.13
• 7.0.14
• 7.0.15
• 7.0.16
• 7.0.17
• 7.0.18
• 7.0.19
• 7.0.20
• 7.0.21
• 7.0.22
• 7.0.23
• 7.0.24
• 7.0.25
• 7.0.26
• 7.0.27
• 7.0.28
• 7.0.29
• 7.1.0
• 7.1.1
• 7.1.2
• 7.1.3
• 7.1.4
• 7.1.5
• 7.1.6
• 7.1.7
• 7.1.8
• 7.1.9
• 7.1.10
• 7.1.11
• 7.1.12
• 7.1.13
• 7.1.14
• 7.1.15
• 7.1.16
• 7.2.0
• 7.2.1
• 7.2.2
• 7.2.3
• 7.2.4

License

• open-source

Website

• Product: https://www.php.org/

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

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 109878
Nessus Name: openSUSE Security Update : php5 (openSUSE-2018-465)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 61614
OpenVAS Name: PHP Multiple Vulnerabilities May18 (Linux)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: PHP 5.6.36/7.0.30/7.1.17/7.2.5

Timelineinfo

04/26/2018 🔍
04/27/2018 +1 days 🔍
04/29/2018 +1 days 🔍
04/29/2018 +0 days 🔍
04/29/2018 +0 days 🔍
04/30/2018 +1 days 🔍
05/16/2018 +16 days 🔍
05/17/2018 +1 days 🔍
03/08/2023 +1756 days 🔍

Sourcesinfo

Product: php.org

Advisory: RHSA-2019:2519
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-10546 (🔍)
GCVE (CVE): GCVE-0-2018-10546
GCVE (VulDB): GCVE-100-117204

OVAL: 🔍

SecurityFocus: 104019 - PHP Multiple Security Vulnerabilities
SecurityTracker: 1040807

See also: 🔍

Entryinfo

Created: 04/30/2018 09:06
Updated: 03/08/2023 09:03
Changes: 04/30/2018 09:06 (78), 02/01/2020 10:58 (5), 03/08/2023 09:03 (5)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

Discussion

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