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Vulnerability of Oracle Database: brute force on authentication

Synthesis of the vulnerability 

A network attacker can use a brute force attack on the authentication protocol version 11 of Oracle Database, in order to login in five hours.
Vulnerable systems: Oracle DB.
Severity of this threat: 2/4.
Creation date: 21/09/2012.
Références of this weakness: BID-55651, cpuoct2012, CVE-2012-3137, VIGILANCE-VUL-11966.

Description of the vulnerability 

The access to Oracle Database requires an authentication. The authentication protocol is in version 10, 11.1 or 11.2.

Versions 11.1 and 11.2 use a hash, with a salt. However, the algorithm is weak. An eight characters lowercase password can be retrieved with a brute force of 5 hours.

A network attacker can therefore use a brute force attack on the authentication protocol version 11 of Oracle Database, in order to login in five hours.
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This threat alert impacts software or systems such as Oracle DB.

Our Vigil@nce team determined that the severity of this computer vulnerability bulletin is medium.

The trust level is of type confirmed by the editor, with an origin of intranet client.

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a specialist ability can exploit this weakness note.

Solutions for this threat 

Oracle Database: CPU of October 2012.
A Critical Patch Update is available:
  https://support.oracle.com/rs?type=doc&id=1477727.1

Oracle Database: workaround for brute force.
A workaround is to:
 - use an external authentication
 - change the parameter SEC_CASE_SENSITIVE_LOGON to FALSE
 - delete hashes of version 11g, and only use those of version 10g
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