Scanner FTP Auxiliary Modules. 192.168.1.205:21 Anonymous READ (220 oracle2 Microsoft FTP Service. Exploit Development. A remote Microsoft FTP server exploit was released today by Kingcope, and can be found at A quick examination of the exploit showed some fancy manipulations in a highly restrictive environment that lead to a”useradd.

-- Nazim Lala, IIS Security Program Manager *Posting is provided 'AS IS' with no warranties, and confers no rights.*.

Microsoft security officials said they are investigating the issue. The was posted to the Milw0rm site on Monday, and published an advisory on the vulnerability later in the day, recommending that administrators disable anonymous write access to vulnerable servers.

There has been some discussion around a publicly posted PoC code that exploits a vulnerability in IIS FTP 7.5, which ships with Windows 7 and Windows Server 2008 R2. Our engineering team is looking into the situation and has made a few preliminary observations that might clear up some confusion. We’ve observed three notable characteristics. First, this is a Denial of Service vulnerability and remote code execution is unlikely. The vulnerability occurs when the FTP server attempts to encode character in the FTP response. The IAC character, which is represented as decimal 255 (Hex FF) in the response, needs to be encoded by the addition of another decimal 255 character in the FTP response where we find the presence of the IAC character.

By issuing an FTP NLST (NAME LIST) command on a specially-named directory, an attacker may cause a stack buffer overflow. The attacker can create the specially-named directory if FTP is configured to allow write access using Anonymous account or another account that is available to the attacker,” US-CERT said in its advisory. Microsoft said that it was not aware of any attacks ongoing against IIS servers using the new vulnerability, but with the exploit code on the loose now, that may change quickly. Microsoft’s next patch release is due Sept. 8, but there’s no indication as to whether the company will have a fix ready that quickly.

There is exploit code circulating for a newly discovered vulnerability in the FTP service of Microsoft IIS, a flaw which could enable an attacker to run his own code on a remote server. The flaw mainly affects older versions of IIS, Microsoft’s Web server product, but the existence of a working exploit and the popularity of IIS make the vulnerability a serious concern. Microsoft security officials said they are investigating the issue. The was posted to the Milw0rm site on Monday, and published an advisory on the vulnerability later in the day, recommending that administrators disable anonymous write access to vulnerable servers. However, allowing anonymous users to write to an FTP server isn’t recommended in any case. IIS 5 and 6 are vulnerable to the attack. “The IIS FTP server fails to properly parse specially-crafted directory names.

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Also, the malicious client does not control the addresses where data is overridden, and the data is always overridden in a sequential manner. The FTP service 7.5 is also protected by Data Execution Prevention (DEP).

For administrators and enterprise installations, or end users who want to install this security update manually, Microsoft recommends that customers apply the update at the earliest opportunity using update management software, or by checking for updates using the service. See also the section, Detection and Deployment Tools and Guidance, later in this bulletin. Known Issues. Documents the currently known issues that customers may experience when installing this security update. The article also documents recommended solutions for these issues. Affected and Non-Affected Software The following software have been tested to determine which versions or editions are affected. Other versions or editions are either past their support life cycle or are not affected.

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“The IIS FTP server fails to properly parse specially-crafted directory names. By issuing an FTP NLST (NAME LIST) command on a specially-named directory, an attacker may cause a stack buffer overflow. The attacker can create the specially-named directory if FTP is configured to allow write access using Anonymous account or another account that is available to the attacker,” US-CERT said in its advisory. Microsoft said that it was not aware of any attacks ongoing against IIS servers using the new vulnerability, but with the exploit code on the loose now, that may change quickly. Microsoft’s next patch release is due Sept. 8, but there’s no indication as to whether the company will have a fix ready that quickly.

There is exploit code circulating for a newly discovered vulnerability in the FTP service of Microsoft IIS, a flaw which could enable an attacker to run his own code on a remote server. The flaw mainly affects older versions of IIS, Microsoft’s Web server product, but the existence of a working exploit and the popularity of IIS make the vulnerability a serious concern. Microsoft security officials said they are investigating the issue. The was posted to the Milw0rm site on Monday, and published an advisory on the vulnerability later in the day, recommending that administrators disable anonymous write access to vulnerable servers. However, allowing anonymous users to write to an FTP server isn’t recommended in any case. IIS 5 and 6 are vulnerable to the attack.

A user can determine the status of the IIS FTP service by querying it through the command prompt (running as administrator): Press the “Windows”+“R” key Type “cmd.exe” (no quotes) In the command prompt type “sc query ftpsvc” (no quotes) If the service is not installed then the following will be displayed: > sc query ftpsvc [SC] EnumQueryServicesStatus:OpenService FAILED 1060: The specified service does not exist as an installed service. If the service is installed and running then the following will be displayed: > sc query ftpsvc SERVICE_NAME: ftpsvc TYPE: 20 WIN32_SHARE_PROCESS STATE: 4 RUNNING (STOPPABLE, PAUSABLE, ACCEPTS_SHUTDOWN) WIN32_EXIT_CODE: 0 (0x0) SERVICE_EXIT_CODE: 0 (0x0) CHECKPOINT: 0x0 WAIT_HINT: 0x0 We’ll continue to investigate this issue and, if necessary, we‘ll take appropriate action to help protect customers. This may include providing a security update through the monthly release process or additional guidance to help customers protect themselves. Thanks the MSRC Engineering for the help in looking into this issue. -- Nazim Lala, IIS Security Program Manager *Posting is provided 'AS IS' with no warranties, and confers no rights.*.

If the service is installed and running then the following will be displayed: > sc query ftpsvc SERVICE_NAME: ftpsvc TYPE: 20 WIN32_SHARE_PROCESS STATE: 4 RUNNING (STOPPABLE, PAUSABLE, ACCEPTS_SHUTDOWN) WIN32_EXIT_CODE: 0 (0x0) SERVICE_EXIT_CODE: 0 (0x0) CHECKPOINT: 0x0 WAIT_HINT: 0x0 We’ll continue to investigate this issue and, if necessary, we‘ll take appropriate action to help protect customers. This may include providing a security update through the monthly release process or additional guidance to help customers protect themselves. Thanks the MSRC Engineering for the help in looking into this issue.

However, allowing anonymous users to write to an FTP server isn’t recommended in any case. IIS 5 and 6 are vulnerable to the attack. “The IIS FTP server fails to properly parse specially-crafted directory names.

The combination of these characteristics makes it difficult to successfully execute a heap spray or partial function pointer override attack. Because of the nature of the overrun, the probable result will only be a denial of service and not code execution. Our second discovery is that this vulnerability only affects IIS FTP Service and leaves the IIS Web Services completely unaffected. Hence a Denial of Service on the FTP service will not affect any of the web services hosted by IIS but only the FTP service. Third and finally, the IIS FTP Service is not installed by default, and even after installation, it is not enabled by default.

If an attacker were able to successfully exploit this vulnerability, they could execute code in the context of LocalSystem, the service under which the FTP service runs. Microsoft the vulnerable code is in IIS 5.0 (Windows 2000), IIS 5.1 (Windows XP) and IIS 6.0 (Windows Server 2003). IIS 7.0 (Windows Vista, Windows Server 2008) is not vulnerable. In the absence of a patch, Microsoft recommends that administrators prevent untrusted users from having write access to the FTP service. The contains instructions to: • Turn off the FTP service if you do not need it. • Prevent creation of new directories using NTFS ACLs. • Prevent anonymous users from writing via IIS service.

Anonymous The “ftp/anonymous” scanner will scan a range of IP addresses searching for FTP servers that allow anonymous access and determines where read or write permissions are allowed. Msf > use auxiliary/scanner/ftp/anonymous msf auxiliary( anonymous) > show options Module options: Name Current Setting Required Description ---- --------------- -------- ----------- FTPPASS mozilla@example.com no The password for the specified username FTPUSER anonymous no The username to authenticate as RHOSTS yes The target address range or CIDR identifier RPORT 21 yes The target port THREADS 1 yes The number of concurrent threads Configuring the module is a simple matter of setting the IP range we wish to scan along with the number of concurrent threads and let it run.