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Files from Yorick Koster

Real NameYorick Koster
Email addressprivate
Websitenl.linkedin.com/in/yorickkoster
First Active2009-07-17
Last Active2020-09-30
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Cisco AnyConnect Privilege Escalation
Posted Sep 30, 2020
Authored by Yorick Koster, Christophe de la Fuente, Antoine Goichot | Site metasploit.com

The installer component of Cisco AnyConnect Secure Mobility Client for Windows prior to 4.8.02042 is vulnerable to path traversal and allows local attackers to create/overwrite files in arbitrary locations with system level privileges. The installer component of Cisco AnyConnect Secure Mobility Client for Windows prior to 4.9.00086 is vulnerable to a DLL hijacking and allows local attackers to execute code on the affected machine with with system level privileges. Both attacks consist in sending a specially crafted IPC request to the TCP port 62522 on the loopback device, which is exposed by the Cisco AnyConnect Secure Mobility Agent service.

tags | exploit, arbitrary, local, tcp
systems | cisco, windows
advisories | CVE-2020-3153, CVE-2020-3433
MD5 | 6dab51a6758b6569e7dba4af74f482ed
Microsoft OneDrive 19.232.1124.0010 DLL Hijacking
Posted Jul 10, 2020
Authored by Yorick Koster, Securify B.V.

A file hijacking vulnerability was found in the Microsoft OneDrive client. This vulnerability allows a local attacker to plant a DLL file on the local machine. This DLL will then be loaded whenever (another) user launches OneDrive, running with the privileges of the victim. This issue was successfully verified on Microsoft OneDrive version 19.232.1124.0010.

tags | exploit, local
MD5 | 834603f1a95f27a160459efee2807af1
Cisco AnyConnect Path Traversal / Privilege Escalation
Posted Jun 25, 2020
Authored by Yorick Koster, Christophe de la Fuente, Antoine Goichot | Site metasploit.com

The installer component of Cisco AnyConnect Secure Mobility Client for Windows prior to version 4.8.02042 is vulnerable to path traversal and allows local attackers to create/overwrite files in arbitrary locations with system level privileges. The attack consists in sending a specially crafted IPC request to the TCP port 62522 on the loopback device, which is exposed by the Cisco AnyConnect Secure Mobility Agent service. This service will then launch the vulnerable installer component (vpndownloader), which copies itself to an arbitrary location before being executed with system privileges. Since vpndownloader is also vulnerable to DLL hijacking, a specially crafted DLL (dbghelp.dll) is created at the same location vpndownloader will be copied to get code execution with system privileges. This exploit has been successfully tested against Cisco AnyConnect Secure Mobility Client versions 4.5.04029, 4.5.05030 and 4.7.04056 on Windows 10 version 1909 (x64) and Windows 7 SP1 (x86).

tags | exploit, arbitrary, x86, local, tcp, code execution
systems | cisco, windows, 7
advisories | CVE-2020-3153
MD5 | 0ce466f922be78b19e5b1169c13ef711
Cisco AnyConnect Secure Mobility Client 4.8.01090 Privilege Escalation
Posted Apr 21, 2020
Authored by Yorick Koster, Securify B.V.

Cisco AnyConnect Secure Mobility Client for Windows version 4.8.01090 suffer from a privilege escalation vulnerability due to insecure handling of path names.

tags | exploit
systems | cisco, windows
advisories | CVE-2020-3153
MD5 | e5a3959bc7c5608c73bf90960397d443
QRadar Community Edition 7.3.1.6 Path Traversal
Posted Apr 21, 2020
Authored by Yorick Koster, Securify B.V.

QRadar Community Edition version 7.3.1.6 has a path traversal that exists in the session validation functionality. In particular, the vulnerability is present in the part that handles session tokens (UUIDs). QRadar fails to validate if the user-supplied token is in the correct format. Using path traversal it is possible for authenticated users to impersonate other users, and also to executed arbitrary code (via Java deserialization). The code will be executed with the privileges of the Tomcat system user.

tags | exploit, java, arbitrary, file inclusion
MD5 | 6cb180e7e16b46cc6581407a5507d0a0
QRadar Community Edition 7.3.1.6 Authorization Bypass
Posted Apr 21, 2020
Authored by Yorick Koster, Securify B.V.

QRadar Community Edition version 7.3.1.6 suffers from an authorization bypass vulnerability.

tags | exploit, bypass
advisories | CVE-2020-4274
MD5 | 9f24dd39f62a7f642dc8c11ad679f568
QRadar Community Edition 7.3.1.6 Arbitrary Object Instantiation
Posted Apr 21, 2020
Authored by Yorick Koster, Securify B.V.

QRadar Community Edition version 7.3.1.6 is vulnerable to instantiation of arbitrary objects based on user-supplied input. An authenticated attacker can abuse this to perform various types of attacks including server-side request forgery and (potentially) arbitrary execution of code.

tags | exploit, arbitrary, file inclusion
advisories | CVE-2020-4272
MD5 | f813c8f629536b1985d46109b98d02f8
QRadar Community Edition 7.3.1.6 PHP Object Injection
Posted Apr 21, 2020
Authored by Yorick Koster, Securify B.V.

QRadar Community Edition version 7.3.1.6 suffers from a php object injection vulnerability.

tags | exploit, php
advisories | CVE-2020-4271
MD5 | 829d59fdbec4c7b0c02f591307aaf419
QRadar Community Edition 7.3.1.6 Insecure File Permissions
Posted Apr 21, 2020
Authored by Yorick Koster, Securify B.V.

QRadar Community Edition version 7.3.1.6 suffers from a local privilege escalation due to insecure file permissions with run-result-reader.sh.

tags | exploit, local
advisories | CVE-2020-4270
MD5 | 78916b6ddfb832ae9b4373ee1c58da01
QRadar Community Edition 7.3.1.6 Cross Site Scripting
Posted Apr 21, 2020
Authored by Yorick Koster, Securify B.V.

QRadar Community Edition version 7.3.1.6 suffers from a reflective cross site scripting vulnerability in the Forensics link analysis page.

tags | exploit, xss
MD5 | fe186d0de8d1507e14a349eb48108ff7
QRadar Community Edition 7.3.1.6 CSRF / Weak Access Control
Posted Apr 21, 2020
Authored by Yorick Koster, Securify B.V.

QRadar Community Edition version 7.3.1.6 suffers from cross site request forgery and weak access control vulnerabilities.

tags | exploit, vulnerability, csrf
MD5 | c78a8cc9951bc948028d5c3082e91a0f
QRadar Community Edition 7.3.1.6 Server Side Request Forgery
Posted Apr 21, 2020
Authored by Yorick Koster, Securify B.V.

QRadar Community Edition version 7.3.1.6 has an issue where the RssFeedItem class of the QRadar web application is used to fetch and parse RSS feeds. No validation is performed on the user-supplied RSS feed URL. Due to the lack of URL validation (whitelisting), it is possible for authenticated attackers to execute Server-Side Request Forgery attacks. Using this issue it is possible to call the Apache Axis AdminService webservice in order to execute arbitrary code with the privileges of the Tomcat user.

tags | exploit, web, arbitrary
advisories | CVE-2020-4294
MD5 | de790813f9ae985ff869c69760705113
QRadar Community Edition 7.3.1.6 Default Credentials
Posted Apr 21, 2020
Authored by Yorick Koster, Securify B.V.

QRadar Community Edition version 7.3.1.6 is deployed with a default password for the ConfigServices account. Using this default password it is possible to download configuration sets containing sensitive information, including (encrypted) credentials and host tokens. With these host tokens it is possible to access other parts of QRadar.

tags | exploit
advisories | CVE-2020-4269
MD5 | 2a17539a1ba52a631c01849db48b744c
ZoneAlarm TrueVector Internet Monitor Insecure NTFS Permissions
Posted Mar 18, 2020
Authored by Yorick Koster, Securify B.V.

A vulnerability was found in the TrueVector Internet Monitor service, which is installed as part of the Check Point ZoneAlarm firewall. This vulnerability allows a local attacker to cause the affected service to change the file permissions of arbitrary local files. After the file permissions have been changed, the attacker can then overwrite its content, and ultimately gain elevated privileges on the vulnerable machine. This vulnerability was successfully verified on ZoneAlarm Free Firewall version 15.8.023.18219 and TrueVector Internet Monitor version 15.8.7.18219.

tags | exploit, arbitrary, local
MD5 | 1e8fb7ac9173e275aa2f2eb88bbbecd5
Ivanti Workspace Control UNC Path Data Security Bypass
Posted Oct 1, 2018
Authored by Yorick Koster, Securify B.V.

Ivanti Workspace Control contains a flaw where it is possible to access folders that should be protected by Data Security. A local attacker can bypass these restrictions using localhost UNC paths. Depending on the NTFS permissions it may be possible for local users to access files and folders that should be protected using Data Protection. This issue was successfully verified on Ivanti Workspace Control version 10.2.700.1 and 10.2.950.0.

tags | advisory, local, bypass
MD5 | 148e251d9ddfd0423ac5e26fca7cc59a
Ivanti Workspace Control Registry Stored Credentials
Posted Oct 1, 2018
Authored by Yorick Koster, Securify B.V.

A flaw was found in Workspace Control that allows a local unprivileged user to retrieve the database or Relay server credentials from the Windows Registry. These credentials are encrypted, however the encryption that is used is reversible. This issue was successfully verified on Ivanti Workspace Control version 10.2.700.1 and 10.2.950.0.

tags | advisory, local, registry
systems | windows
MD5 | 40fda4c2a16f2e00046340df84539054
Ivanti Workspace Control Named Pipe Privilege Escalation
Posted Oct 1, 2018
Authored by Yorick Koster, Securify B.V.

It was found that Ivanti Workspace Control allows a local (unprivileged) attacker to run arbitrary commands with Administrator privileges. This issue can be exploited by spawning a new Composer process, injecting a malicious thread in this process. This thread connects to a Named Pipe and sends an instruction to a service to launch an attacker-defined application with elevated privileges. This issue was successfully verified on Ivanti Workspace Control version 10.2.700.1 and 10.2.950.0.

tags | advisory, arbitrary, local
MD5 | 7ee90d03763dd9d1bf3d0ff765a7bab3
Ivanti Workspace Control Application PowerGrid SEE Whitelist Bypass
Posted Oct 1, 2018
Authored by Yorick Koster, Securify B.V.

It was found that the PowerGrid application can be used to run arbitrary commands via the /SEE command line option. An attacker can abuse this issue to bypass Application Whitelisting in order to run arbitrary code on the target machine. This issue was successfully verified on Ivanti Workspace Control version 10.2.950.0.

tags | exploit, arbitrary, bypass
MD5 | 40d40eb07c533689a9146b8d54b35a20
Ivanti Workspace Control Application PowerGrid RWS Whitelist Bypass
Posted Oct 1, 2018
Authored by Yorick Koster, Securify B.V.

It was found that the PowerGrid application will execute rundll32.exe from a relative path when it is started with the /RWS command line option. An attacker can abuse this issue to bypass Application Whitelisting in order to run arbitrary code on the target machine. This issue was successfully verified on Ivanti Workspace Control version 10.2.700.1.

tags | exploit, arbitrary, bypass
MD5 | 81f68b864a5e934987060adf6222477b
Seagate Personal Cloud Information Disclosure
Posted Sep 13, 2018
Authored by Yorick Koster

Seagate Personal Cloud is a consumer-grade Network-Attached Storage device (NAS). It was found that the web application used to manage the NAS is affected by various unauthenticated information disclosure vulnerabilities. The device is configured to trust any CORS origin, and is accessible via the personalcloud.local domain name. Due to this it is possible for any website to gain access to this information. While this information doesn't allow an attacker to compromise the NAS, the information can be used to stage more targeted attacks. This issue was tested on a Seagate Personal Cloud model SRN21C running firmware versions 4.3.16.0 and 4.3.18.0. The software is licensed from LACIE, it is very likely that other devices/models are also affected.

tags | exploit, web, local, vulnerability, info disclosure
MD5 | 0c22c4000bdb46ed6b32781ad8339aaa
Seagate Personal Cloud SRN21C SQL Injection
Posted Aug 24, 2018
Authored by Yorick Koster

Seagate Personal Cloud model SRN21C running firmware versions 4.3.16.0 and 4.3.18.0 suffer from remote SQL injection vulnerabilities in the media server.

tags | exploit, remote, vulnerability, sql injection
MD5 | 49608d47de2121c9942d55cc4e76e5db
Seagate Media Server SRN21C Cross Site Scripting
Posted Apr 19, 2018
Authored by Yorick Koster

Seagate Personal Cloud model SRN21C running firmware versions 4.3.16.0 and 4.3.18.0 suffers from a persistent cross site scripting vulnerabilities.

tags | exploit, vulnerability, xss
MD5 | 26ee374c709608e517d6ee7adb023c0b
Seagate Media Server Path Traversal
Posted Apr 19, 2018
Authored by Yorick Koster

Seagate Personal Cloud model SRN21C running firmware versions 4.3.16.0 and 4.3.18.0 suffer from a path traversal vulnerability.

tags | exploit, file inclusion
MD5 | 87a733abc7f20117965d25472991a72b
Seagate Personal Cloud SRN21C Arbitrary File Move
Posted Apr 19, 2018
Authored by Yorick Koster

Seagate Personal Cloud model SRN21C running firmware versions 4.3.16.0 and 4.3.18.0 allows for moving of arbitrary files.

tags | exploit, arbitrary
MD5 | 4a1b51ad89566e53f422c327f916fb1c
Seagate Personal Cloud Command Injection
Posted Jan 16, 2018
Authored by Yorick Koster

Seagate Personal Cloud suffers from multiple command injection vulnerabilities.

tags | exploit, vulnerability
advisories | CVE-2018-5347
MD5 | 04f30f1082f4a8d1b8093ffe831d0de2
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