KDE Konqueror 4.7.3 Image scaledimageplane.h scaleLoop memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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9.0$0-$5k0.00

A vulnerability was found in KDE Konqueror 4.7.3 (Web Browser). It has been declared as critical. Affected by this vulnerability is the function scaleLoop of the file khtml/imload/scaledimageplane.h of the component Image Handler. The manipulation with the input value canvas.width = 111111 leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

khtml/imload/scaledimageplane.h in Konqueror in KDE 4.7.3 allows remote attackers to cause a denial of service (crash) and possibly read memory via large canvas dimensions, which leads to an unexpected sign extension and a heap-based buffer over-read.

The weakness was disclosed 10/10/2012 by Tim Brown with Nth Dimension as NDSA20121010 as confirmed advisory (Website). It is possible to read the advisory at nth-dimension.org.uk. The public release has been coordinated in cooperation with KDE. This vulnerability is known as CVE-2012-4513 since 08/21/2012. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details and also a public exploit are known. According to KDE, in the case of 64-bit systems this appeared only to allow a crash to be triggered however on 32-bit systems it could lead to memory disclosure.

A public exploit has been developed by Tim Brown in HTML/Javascript and been published immediately after the advisory. It is possible to download the exploit at nth-dimension.org.uk. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 97 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 62764 (CentOS 6 : kdelibs (CESA-2012:1418)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 166215 (SUSE Enterprise Linux Security Update for kdelibs4 (SUSE-SU-2013:1559-1)). There are apparently issues in reproducing this vulnerability.

Applying the patch Revision 1f8b1b03 is able to eliminate this problem. The bugfix is ready for download at projects.kde.org. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (62764) and Exploit-DB (22406). Additional details are provided at seclists.org. The entries 6848, 6849, 6851 and 52161 are pretty similar.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.0

VulDB Base Score: 10.0
VulDB Temp Score: 9.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Tim Brown
Reliability: 🔍
Programming Language: 🔍
Download: 🔍

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Nessus ID: 62764
Nessus Name: CentOS 6 : kdelibs (CESA-2012:1418)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 881530
OpenVAS Name: CentOS Update for kdelibs CESA-2012:1416 centos6
OpenVAS File: 🔍
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Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

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Patch: Revision 1f8b1b03

Timelineinfo

11/01/2011 🔍
11/06/2011 +5 days 🔍
02/06/2012 +92 days 🔍
08/21/2012 +197 days 🔍
10/10/2012 +50 days 🔍
10/10/2012 +0 days 🔍
10/11/2012 +1 days 🔍
10/31/2012 +20 days 🔍
10/31/2012 +0 days 🔍
10/31/2012 +0 days 🔍
11/01/2012 +1 days 🔍
11/01/2012 +0 days 🔍
11/04/2012 +3 days 🔍
11/04/2012 +0 days 🔍
11/11/2012 +7 days 🔍
04/18/2021 +3080 days 🔍

Sourcesinfo

Vendor: kde.org

Advisory: NDSA20121010
Researcher: Tim Brown
Organization: Nth Dimension
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2012-4513 (🔍)
OVAL: 🔍

SecurityTracker: 1027709 - kdelibs Heap Overflows Let Remote Users Execute Arbitrary Code
Vulnerability Center: 36935 - KDE Konqueror 4.7.3 Canvas Out of Bounds Memory Access Vulnerability Allows Remote DoS, Medium
SecurityFocus: 55879 - KDE Konqueror Multiple Security Vulnerabilities
Secunia: 51097 - KDE kdelibs Multiple Vulnerabilities, Highly Critical
OSVDB: 86825

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

Entryinfo

Created: 11/04/2012 14:52
Updated: 04/18/2021 17:19
Changes: 11/04/2012 14:52 (109), 04/20/2017 13:55 (6), 04/18/2021 17:19 (2)
Complete: 🔍
Cache ID: 13:E60:103

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