PHP 5.2.4 iconv_substr input validation

CVSS Meta Temp Score
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CTI Interest Score
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4.8$0-$5k0.00

Summaryinfo

A vulnerability was found in PHP 5.2.4 and classified as problematic. This affects the function iconv_substr. The manipulation of the argument str results in input validation. This vulnerability is known as CVE-2007-4783. Furthermore, an exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in PHP 5.2.4 (Programming Language Software). Affected is the function iconv_substr. The manipulation of the argument str 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 iconv_substr function in PHP 5.2.4 and earlier allows context-dependent attackers to cause (1) a denial of service (application crash) via a long string in the charset parameter, probably also requiring a long string in the str parameter; or (2) a denial of service (temporary application hang) via a long string in the str parameter. NOTE: this might not be a vulnerability in most web server environments that support multiple threads, unless these issues can be demonstrated for code execution.

The bug was discovered 09/05/2007. The weakness was published 09/05/2007 by Laurent Gaffie with SecurityReason as not defined posting (Bugtraq). The advisory is shared for download at securityfocus.com. This vulnerability is traded as CVE-2007-4783 since 09/10/2007. The exploitability is told to be easy. 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.

The exploit is shared for download at securityfocus.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 26942 (GLSA-200710-02 : PHP: Multiple vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Gentoo Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 12257 (PHP update 5.2.5 not installed).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (38753), Tenable (26942), SecurityFocus (BID 26403†), OSVDB (38917†) and Secunia (SA27102†). Similar entries are available at VDB-3287, VDB-3284, VDB-3285 and VDB-3282. Once again VulDB remains the best source for vulnerability data.

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CVSSv4info

VulDB Vector: 🔍
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CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

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

Physical: No
Local: No
Remote: Yes

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

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Price Prediction: 🔍
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Nessus ID: 26942
Nessus Name: GLSA-200710-02 : PHP: Multiple vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 835181
OpenVAS Name: HP StorageWorks Default Accounts and Directory Traversal Vulnerabilities
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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Timelineinfo

09/05/2007 🔍
09/05/2007 +0 days 🔍
09/10/2007 +5 days 🔍
09/10/2007 +0 days 🔍
09/10/2007 +0 days 🔍
10/07/2007 +27 days 🔍
10/08/2007 +1 days 🔍
10/09/2007 +1 days 🔍
10/14/2007 +5 days 🔍
11/08/2007 +25 days 🔍
11/29/2007 +21 days 🔍
03/16/2015 +2663 days 🔍
06/04/2025 +3733 days 🔍

Sourcesinfo

Product: php.org

Advisory: securityfocus.com⛔
Researcher: Laurent Gaffie
Organization: SecurityReason
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2007-4783 (🔍)
GCVE (CVE): GCVE-0-2007-4783
GCVE (VulDB): GCVE-100-38700
X-Force: 38753
SecurityFocus: 26403 - PHP 5.2.4 and Prior Versions Multiple Vulnerabilities
Secunia: 27102
OSVDB: 38917 - PHP iconv_substr Function Multiple Parameter Remote DoS
Vulnerability Center: 16518 - PHP 5.2.4 and earlier Remote Denial of Service via Long Strings to iconv_substr Function, Medium

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

Entryinfo

Created: 03/16/2015 12:18
Updated: 06/04/2025 16:34
Changes: 03/16/2015 12:18 (77), 07/27/2019 16:45 (10), 06/04/2025 16:34 (20)
Complete: 🔍
Cache ID: 216::103

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