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Vulnerability Alert

Opera HTTP Response Buffer Overflow Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:27445
Version:2
First Published:2012 November 21 12:11 GMT
Last Published:2012 November 26 20:38 GMT
Port: Not available
BugTraq ID:56594
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:10.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:7.4
 
 
Version Summary:FreeBSD has released a VuXML document and updated ports collection to address the Opera HTTP response buffer overflow vulnerability.
 
 
Description
Opera contains a vulnerability that could allow an unauthenticated, remote attacker to cause buffer overflow on the targeted system.

The vulnerability is due to the improper handling of HTTP responses by the affected software. An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a malicious website. Successful exploitation could allow an attacker to cause buffer overflow condition and execute arbitrary code on the targeted system.

Opera has confirmed this vulnerability and released updated software.
 
Warning Indicators
Opera versions prior to 12.11 are vulnerable.
 
IntelliShield Analysis
To exploit the vulnerability, the attacker may provide a link that directs a user to a malicious site and may use misleading language or instructions to convince the user to follow the link.
 
Vendor Announcements
Opera has released a security advisory at the following link: Opera 1036

FreeBSD has released a VuXML document at the following link: opera -- execution of arbitrary code
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause buffer overflow on the targeted system. A successful exploitation could allow an attacker to execute arbitrary code on the targeted system.
 
Technical Information
The vulnerability exists because the affected software does not properly perform sufficient bounds checks on user-supplied input while storing HTTP responses. The affected software could incorrectly allocate the proper buffer size that is required to store the HTTP response, possibly leading to memory corruption error.

An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to view a malicious website. Successful exploitation could allow an attacker to cause a buffer overflow condition and possibly execute arbitrary code on the targeted system.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Users are advised not to follow unsolicited links.

Administrators are advised to monitor affected systems.
 
Patches/Software
Opera has released updated software at the following links:

Opera 12.11 for Windows
Opera 12.11 for Mac
Opera 12.11 for Linux

FreeBSD releases ports collection updates at the following link: Ports Collection Index
 
Alert History
 
Version 1, November 21, 2012, 8:11 AM: Opera contains a vulnerability that could allow an unauthenticated, remote attacker to cause a buffer overflow condition on the targeted system. Updates are available.


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
Opera Software ASAOpera for Linux 11.00 Base | 11.01 Base | 11.10 Base | 11.11 Base | 11.50 Base | 11.51 Base | 11.52 Base | 11.60 Base | 12.00 Base | 12.01 Base | 12.02 Base | 12.10 Base
Opera Software ASAOpera for Mac 11.00 Base | 11.01 Base | 11.11 Base | 11.10 Base | 11.50 Base | 11.51 Base | 11.52 Base | 11.60 Base, .61, .62, .63, .64, .65 | 12.00 Base | 12.01 Base | 12.02 Base | 12.10 Base
Opera Software ASAOpera for Windows 11.00 Base | 11.01 Base | 11.10 Base | 11.11 Base | 11.50 Base | 11.51 Base | 11.52 Base | 11.60 Base | 11.62 Base | 11.64 Base | 11.66 Base | 12.00 Base | 12.01 Base | 12.02 Base | 12.10 Base

Associated Products:
FreeBSD ProjectFreeBSD 6.3 Base | 6.4 Base | 7.0 Base | 7.1 Base | 7.2 Base | 7.3 Base | 7.4 Base | 8.0 Base | 8.1 Base | 8.2 Base | 8.3 Base | 9.0 Base




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