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AppSecInc Team SHATTER Security Advisory

OCIPasswordChange API leaks information of password hash.

Risk Level:

High

Affected versions:

Oracle Database Server version 10gR1, 10gR2 (10.2.0.4 and previous

patchsets) and 11gR1 (11.1.0.7 and previous patchsets)

Remote exploitable:

Yes (No authentication is required)

Credits:

This vulnerability was discovered and researched by Esteban Martinez

Fayo of Application Security Inc.

Details:

Oracle Database provides OCIPasswordChange API to change user passwords.

This API can be used while a user is logged on as well as before the

authentication process is completed, this is because it can be used for

accounts that have the password expired so that the user is able to

change an expired password for a new one.

It was observed that for locked accounts this API leaks information

about the correct user password hash by giving different responses,

depending on whether the decryption of the new password

(AUTH_NEW_PASSWORD field), performed by the server, is successful or

not. This information can be used to perform an off-line brute force

attack to guess the correct password. Internal proof-of-concept tool

demonstrated that it is possible to try millions of passwords per

second, making it possible to crack passwords that are less than 9

characters length in a few hours.

Note that to perform this attack the account must be locked. An

attacker can lock an account by reaching the maximum failed login

attempts limit (by default 10). The attacker will be able to log in as

the user once the account is unlocked.

Impact:

Remote unauthenticated attackers can perform off-line unlimited password

guesses on locked database accounts.

Vendor Status:

Vendor was contacted and a patch was released.

Workaround:

Implement a strong password policy.

Use some kind of external authentication (like network or directory

service based) instead of native database authentication.

Fix:

Apply Oracle Critical Patch Update April 2012 available at Oracle Support.

CVE:

CVE-2012-0511

Links:

http://www.oracle.com/technetwork/topics/security/cpuapr2012-366314.html

https://www.teamshatter.com/?p=3434

Timeline:

Vendor Notification - 12/08/2011

Vendor Response - 12/15/2011

Fix - 4/17/2012

Public Disclosure - 4/19/2012

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_____________________________________________

Copyright (c) 2012 Application Security, Inc.

http://www.appsecinc.com

About Application Security, Inc.

AppSecInc is a pioneer and leading provider of database security

solutions for the enterprise.

By providing strategic and scalable software-only solutions -

AppDetectivePro for auditors and IT advisors, and DbProtect for the

enterprise - AppSecInc supports the database security lifecycle for some

of the most complex and demanding environments in the world across more

than 1,300 active commercial and government customers.

Leveraging the world's most comprehensive database security

knowledgebase from the company's renowned team of threat researchers,

TeamSHATTER, AppSecInc products help customers achieve unprecedented

levels of data security from nefarious or accidental activities, while

reducing overall risk and helping to ensure continuous regulatory and

industry compliance.

Disclaimer: The information in the advisory is believed to be accurate

at the time of publishing based on currently available information. Use

of the information constitutes acceptance for use in an AS IS condition.

There are no warranties with regard to this information. Neither the

author nor the publisher accepts any liability for any direct, indirect,

or consequential loss or damage arising from use of, or reliance on,

this information.

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