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1979 changes to exploits/shellcodes Couchdb 1.5.0 - 'uuids' Denial of Service Apache CouchDB 1.5.0 - 'uuids' Denial of Service Beyond Remote 2.2.5.3 - Denial of Service (PoC) udisks2 2.8.0 - Denial of Service (PoC) Termite 3.4 - Denial of Service (PoC) SoftX FTP Client 3.3 - Denial of Service (PoC) Silverstripe 2.3.5 - Cross-Site Request Forgery / Open redirection SilverStripe CMS 2.3.5 - Cross-Site Request Forgery / Open Redirection Silverstripe CMS 3.0.2 - Multiple Vulnerabilities SilverStripe CMS 3.0.2 - Multiple Vulnerabilities Silverstripe CMS 2.4 - File Renaming Security Bypass SilverStripe CMS 2.4 - File Renaming Security Bypass Silverstripe CMS 2.4.5 - Multiple Cross-Site Scripting Vulnerabilities SilverStripe CMS 2.4.5 - Multiple Cross-Site Scripting Vulnerabilities Silverstripe CMS 2.4.7 - 'install.php' PHP Code Injection SilverStripe CMS 2.4.7 - 'install.php' PHP Code Injection Silverstripe Pixlr Image Editor - 'upload.php' Arbitrary File Upload SilverStripe CMS Pixlr Image Editor - 'upload.php' Arbitrary File Upload Silverstripe CMS 2.4.x - 'BackURL' Open Redirection SilverStripe CMS 2.4.x - 'BackURL' Open Redirection Silverstripe CMS - 'MemberLoginForm.php' Information Disclosure SilverStripe CMS - 'MemberLoginForm.php' Information Disclosure Silverstripe CMS - Multiple HTML Injection Vulnerabilities SilverStripe CMS - Multiple HTML Injection Vulnerabilities Apache CouchDB 1.7.0 and 2.x before 2.1.1 - Remote Privilege Escalation Apache CouchDB 1.7.0 / 2.x < 2.1.1 - Remote Privilege Escalation Monstra CMS before 3.0.4 - Cross-Site Scripting Monstra CMS < 3.0.4 - Cross-Site Scripting (2) Monstra CMS < 3.0.4 - Cross-Site Scripting Monstra CMS < 3.0.4 - Cross-Site Scripting (1) Navigate CMS 2.8 - Cross-Site Scripting Collectric CMU 1.0 - 'lang' SQL injection Joomla! Component CW Article Attachments 1.0.6 - 'id' SQL Injection LG SuperSign EZ CMS 2.5 - Remote Code Execution MyBB Visual Editor 1.8.18 - Cross-Site Scripting Joomla! Component AMGallery 1.2.3 - 'filter_category_id' SQL Injection Joomla! Component Micro Deal Factory 2.4.0 - 'id' SQL Injection RICOH Aficio MP 301 Printer - Cross-Site Scripting Joomla! Component Auction Factory 4.5.5 - 'filter_order' SQL Injection RICOH MP C6003 Printer - Cross-Site Scripting Linux/ARM - Egghunter (PWN!) + execve(_/bin/sh__ NULL_ NULL) Shellcode (28 Bytes) Linux/ARM - sigaction() Based Egghunter (PWN!) + execve(_/bin/sh__ NULL_ NULL) Shellcode (52 Bytes)
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Vulnerability Type: Detection Bypass
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Affected Product: Suricata
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Vulnerable version: <4.0.4
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CVE number: CVE-2018-6794
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Found: 25.01.2018
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By: Kirill Shipulin (@kirill_wow), Positive Technologies
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Severity: Medium
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------------------------------------------
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About Suricata:
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---------------
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Suricata is a high performance Network Threat Detection, IDS, IPS and Network Security Monitoring engine. Open Source and owned by a community run non-profit foundation, the Open Information Security Foundation (OISF). Suricata is developed by the OISF, its supporting vendors and the community
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Attack Description:
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-------------------
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If as a server side you break a normal TCP 3 way handshake packets order and inject some response data before 3whs is complete then data still will be received by the a client but some IDS engines may skip content checks on that.
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Attack scenario TCP flow scheme:
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Client -> [SYN] [Seq=0 Ack= 0] -> Evil Server
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Client <- [SYN, ACK] [Seq=0 Ack= 1] <- Evil Server
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Client <- [PSH, ACK] [Seq=1 Ack= 1] <- Evil Server # Injection before the 3whs is completed
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Client <- [FIN, ACK] [Seq=83 Ack= 1] <- Evil Server
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Client -> [ACK] [Seq=1 Ack= 84] -> Evil Server
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Client -> [PSH, ACK] [Seq=1 Ack= 84] -> Evil Server
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IDS signature checks for tcp stream or http response body will be skipped in the case of data injection. This attack technique requires all three packets from a malicious server to be received by a client side together before it completes 3whs. Proof of concept server was written in C to reproduce this and it works reliably in local networks. Since some network devices may affect packets transmission exploitation is not so reliable for the internet scenario.
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This attack possibly may impact other network monitoring or intrusion detection systems because is not limited to Suricata IDS: an old Snort IDS version 2.9.4 is also affected.
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Successful exploitation leads to a complete TCP-Stream response or HTTP response signatures bypass and may be used to prevent malicious payloads from network detection.
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PoС:
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----
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A Working PoC server is available here: https://github.com/kirillwow/ids_bypass
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There is also a traffic capture of this data injection technique.
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Timeline Summary:
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-----------------
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2018-01-25: Issue submitted to the bug tracker.
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2018-01-30: Patch ready.
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2018-02-14: Suricata 4.0.4 containing the fix has been released.
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References:
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-----------
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CVE-2018-6794
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https://redmine.openinfosecfoundation.org/issues/2427
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Contacts:
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---------
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Twitter: https://twitter.com/AttackDetection
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Twitter: https://twitter.com/kirill_wow
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Telegram: https://t.me/kirill_wow
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Proof of Concept:
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https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/44247.zip |