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Click here to get in touch or call us on Compatible mobile devices can access e-mail, calendar, contact, and task data in addition to documents stored on Windows SharePoint Services sites and Windows file shares. Information synchronized with the mobile devices is retained and can be accessed offline. When the system reveals a username exists either due to misconfiguration or a design decision a username enumeration issue exists. This is often identified in authentication interfaces, registration forms, and forgotten password functionality.
The information disclosed by the system can be used to determines a list of users which can then be used in further attacks such as a bruteforce — since the username is known to be correct, only the password needs to be guessed, greatly increasing the chances of successfully compromising an account. During the assessment of a 3rd party product which utilises ActiveSync, it was noted that the there was a clear response difference between a valid and invalid usernames submitted in the HTTP Basic Authentication Header.
Further investigation revealed that the issue was in fact in Office rather than the 3rd party product which was simply acting as a proxy. In order to elicit a response from ActiveSync a number of parameters and headers are required, this is described in more detail here: The username enumeration issue exists in the differing response to invalid vs valid usernames submitted in the Authorization header.
This request header value consists of the username and password concatenated with a colon: The request below contains the following Base64 encoded credentials in the Authorization header: By iterating through a list of potential usernames and observing the response, it is possible to enumerate a list of valid users which can then be targeted for further attacks.
These attacks may be directly against the authentication, i. It should be noted that this issues requires an authentication attempt and is therefore likely to appear in logs, and has a risk of locking out accounts. However it is also possible that a valid username and password combination will be identified, in which case the response is different depending on if 2FA is enabled or not.
It should be noted that only users with a valid mailbox are considered to be valid users in this context, therefore a domain account may exist which this enumeration would identify as invalid. It was found that only Office was affected.
In order to automate exploitation of this issue Oliver wrote a simple multi threaded python script. It is available here: Valid and invalid usernames are logged along with valid username and password combinations in case you get lucky.
Response from Microsoft note only relevant section of email included below. Upon investigation we have determined that these do not meet the bar for security servicing. In general, username enumeration does not meet the bar as there are many ways to do this and on its own it does not allow an attacker access or control in any way, as the attacker would still need to bypass login. Emailed Microsoft stating intention to disclose in a blog post unless they had any serious objections.
Claranet, a leading managed IT services provider, has announced the acquisition of Sec-1 to boost IT security across the group. The acquisition will also provide our customers and employees with many new opportunities, as Claranet offers a wide range of additional services that complement our areas of expertise. We also see opportunities over time to further enhance and develop the security services we currently offer. Malwaretech registered the sandbox detection domain essentially shutting down any further spread overnight; but expect a new version to be released soon.
Microsoft have issued an unusual — out of band — update for unsupported operating systems for ms for xp, 8, etc. Get patching immediately before a new version is released. As far as we currently understand this new strain incorporates active exploitation of the vulnerability patched in the MS update released by Microsoft in March. This is novel behaviour for cryptomalware and we expect this to have widespread effects.
We strongly advise you to ensure all internal systems especially critical domain controllers, fileservers and exchange servers have the MS patch applied as soon as possible. Because of the nature of malware propagation you should ensure that any back-ups are held offline; if backups are offline they cannot be encrypted in the event of your network being hit.
Further updates will be released as we investigate the nature of this attack but do ensure you follow major news feeds on twitter, LinkedIn etc…. Unauthenticated Remote Command Execution Description: Command injection attacks are possible when an application passes unsafe user supplied data forms, cookies, HTTP headers etc. In this attack, the attacker-supplied operating system commands are usually executed with the privileges of the vulnerable application.
Command injection attacks are possible largely due to insufficient input validation. As this vulnerability allows an unauthenticated attacker to gain root level privileges on the affected device, the effects could include: Exploit Example A fully working exploit has been created for this issue for use within the Metasploit Framework.
An example of its use is shown below. This must be an address on the local machine or 0. The Veritas NetBackup Appliance is vulnerable to an unauthenticated OS Command Injection Vulnerability via arguments passed to backend perl scripts when performing license verification. Since it is a blind os command injection vulnerability, there is no output for the executed command when using the cmd generic payload. A ping command against a controlled system could be used for testing purposes.
The exploit uses the wget client from the device to convert the command injection into an arbitrary payload execution. Vendor Response As of version 2.
Veritas are aware that the issue is present in the current version of the product. A fix has been scheduled for the NetBackup Appliances v3. Sec-1 would like to thank Veritas for their very professional and prompt responses in dealing with this matter. Sec-1 Ltd partnered with AppCheck. One of the key findings from the research shows that vulnerabilities introduced through an insecure postMessage implementation are frequently missed by security scanners and consultants performing manual review.
This paper aims to provide an overview of the most common postMessage security flaws and introduce a methodology and toolset for quickly identifying vulnerabilities during the course of a Black-box security assessment.
The following video demonstrates a postMessage flaw identified within the Apple iCloud service. A full analysis of the flaw can be found within the Hunting postMessage Vulnerabilities whitepaper. Username enumeration is when an attacker can determine valid users in a system.
The vulnerability During the assessment of a 3rd party product which utilises ActiveSync, it was noted that the there was a clear response difference between a valid and invalid usernames submitted in the HTTP Basic Authentication Header.
Wed, 14 Jun Wed, 28 Jun Fri, 07 Jul Mon, 24 Jul My continuing mission to replace myself with a small script In order to automate exploitation of this issue Oliver wrote a simple multi threaded python script.
Disclose Timeline 28 June , Details and tool disclosed to the public. Sec-1 is acquired by Claranet to strengthen its future security services Posted on May 31, by dave. Leading MSP moves to enhance skills in penetration testing services to mitigate security breach risks Sec-1 in a strong position to grow as a Claranet Group Company Claranet, a leading managed IT services provider, has announced the acquisition of Sec-1 to boost IT security across the group.
Posted in News Comments Off on Sec-1 is acquired by Claranet to strengthen its future security services. Malwaretech stems Wcry for now Posted on May 13, by dave. Additionally, ensure TCP ports , and are not exposed to the Internet. Further updates will be released as we investigate the nature of this attack but do ensure you follow major news feeds on twitter, LinkedIn etc… Sources: Sec-1 Security Advisory Severity: NetBackup Appliance versions 2.
Matthew Hall Vendor Status: A fix is scheduled for the NetBackup Appliances v3. Matthew Hall Available targets: Cross-Origin communication via postMessage introduces a tainted data source that is difficult to identify using currently available tools. Cross-Site Scripting and Information disclosure vulnerabilities as a result of insecure postMessage code were identified across many Fortune companies and websites listed within the Alexa Top Discussion with members of the development and information security communities show that the vulnerabilities demonstrated within this document are poorly understood.
In many cases postMessage events were not readily identified as a potential source for malicious tainted data. In many cases vulnerable code is introduced via third party libraries and therefore may undermine the security of an otherwise secure application.
Proof of Concept Example: A full analysis of the flaw can be found within the Hunting postMessage Vulnerabilities whitepaper Proof of Concept: