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Security Activity Bulletin

BREACH Exploit Tool Targets TLS Weakness

 
Threat Type:IntelliShield: Security Activity Bulletin
IntelliShield ID:30249
Version:2
First Published:2013 July 29 18:29 GMT
Last Published:2013 August 06 19:56 GMT
Port: Not available
CVE:CVE-2013-3587
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
 
Version Summary:Additional information is available that describes the BREACH exploit tool that an attacker could use to access sensitive information.
 

Description
 
A presentation by security researchers will describe how an attacker could use the BREACH exploit tool to exploit weakness in the HTTP compression mechanism.

An attacker could use the BREACH tool to retrieve session identifiers, CSRF tokens, OAuth tokens, email addresses, and other fields from an HTTPS channel. Although the BREACH tool could allow security professionals to determine levels of exposure and deploy protections against this new attack vector, the BREACH tool may also be used for malicious intent that could allow an attacker to access sensitive information.

BREACH is known to exploit an attacker's ability to observe the length of compressed HTTP responses. An attacker could use the information gathered from the length size of compressed HTTP responses, along with sending crafted HTTPS requests to a targeted site, to guess a secret character by character in an HTTP response body.

US-CERT has released a vulnerability note at the following link:
VU#987798

Administrators may consider disabling HTTP compression on targeted sites or systems.

Administrators are advised to implement an intrusion prevention system (IPS) or intrusion detection system (IDS) to help detect and prevent attacks that attempt to exploit this vulnerability.

Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
2580/0TIME Attack Tool UsageS7322013 Aug 02 
 
Alert History
 
Version 1, July 29, 2013, 6:29 PM: Security researchers at Black Hat USA 2013 will be sharing a proof-of-concept tool called BREACH that could allow an attacker to access sensitive information.


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

Primary Products:
IntelliShieldSecurity Activity Bulletin Original Release Base

Associated Products:
N/A




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The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
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