Vulnerabilities > CVE-2019-11539 - OS Command Injection vulnerability in multiple products
Attack vector
NETWORK Attack complexity
LOW Privileges required
HIGH Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
In Pulse Secure Pulse Connect Secure version 9.0RX before 9.0R3.4, 8.3RX before 8.3R7.1, 8.2RX before 8.2R12.1, and 8.1RX before 8.1R15.1 and Pulse Policy Secure version 9.0RX before 9.0R3.2, 5.4RX before 5.4R7.1, 5.3RX before 5.3R12.1, 5.2RX before 5.2R12.1, and 5.1RX before 5.1R15.1, the admin web interface allows an authenticated attacker to inject and execute commands.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Command Line Execution through SQL Injection An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.
- Command Delimiters An attack of this type exploits a programs' vulnerabilities that allows an attacker's commands to be concatenated onto a legitimate command with the intent of targeting other resources such as the file system or database. The system that uses a filter or a blacklist input validation, as opposed to whitelist validation is vulnerable to an attacker who predicts delimiters (or combinations of delimiters) not present in the filter or blacklist. As with other injection attacks, the attacker uses the command delimiter payload as an entry point to tunnel through the application and activate additional attacks through SQL queries, shell commands, network scanning, and so on.
- Exploiting Multiple Input Interpretation Layers An attacker supplies the target software with input data that contains sequences of special characters designed to bypass input validation logic. This exploit relies on the target making multiples passes over the input data and processing a "layer" of special characters with each pass. In this manner, the attacker can disguise input that would otherwise be rejected as invalid by concealing it with layers of special/escape characters that are stripped off by subsequent processing steps. The goal is to first discover cases where the input validation layer executes before one or more parsing layers. That is, user input may go through the following logic in an application: In such cases, the attacker will need to provide input that will pass through the input validator, but after passing through parser2, will be converted into something that the input validator was supposed to stop.
- Argument Injection An attacker changes the behavior or state of a targeted application through injecting data or command syntax through the targets use of non-validated and non-filtered arguments of exposed services or methods.
- OS Command Injection In this type of an attack, an adversary injects operating system commands into existing application functions. An application that uses untrusted input to build command strings is vulnerable. An adversary can leverage OS command injection in an application to elevate privileges, execute arbitrary commands and compromise the underlying operating system.
Exploit-Db
id EDB-ID:47700 last seen 2019-11-20 modified 2019-11-20 published 2019-11-20 reporter Exploit-DB source https://www.exploit-db.com/download/47700 title Pulse Secure VPN - Arbitrary Command Execution (Metasploit) id EDB-ID:47354 last seen 2019-09-06 modified 2019-09-06 published 2019-09-06 reporter Exploit-DB source https://www.exploit-db.com/download/47354 title Pulse Secure 8.1R15.1/8.2/8.3/9.0 SSL VPN - Remote Code Execution
Metasploit
description | This module exploits a post-auth command injection in the Pulse Secure VPN server to execute commands as root. The env(1) command is used to bypass application whitelisting and run arbitrary commands. Please see related module auxiliary/gather/pulse_secure_file_disclosure for a pre-auth file read that is able to obtain plaintext and hashed credentials, plus session IDs that may be used with this exploit. A valid administrator session ID is required in lieu of untested SSRF. |
id | MSF:EXPLOIT/LINUX/HTTP/PULSE_SECURE_CMD_EXEC |
last seen | 2020-06-14 |
modified | 2020-04-21 |
published | 2019-10-31 |
references | |
reporter | Rapid7 |
source | https://github.com/rapid7/metasploit-framework/blob/master//modules/exploits/linux/http/pulse_secure_cmd_exec.rb |
title | Pulse Secure VPN Arbitrary Command Execution |
Nessus
NASL family Misc. NASL id PULSE_POLICY_SECURE-SA-44101.NASL description According to its self-reported version, the version of Pulse Policy Secure running on the remote host is affected by multiple vulnerabilities. - A session hijacking vulnerability exists in PPS. An unauthenticated, remote attacker can exploit this, to perform actions in the user or administrator interface with the privileges of another user. (CVE-2019-11540) - Multiple vulnerabilities found in the admin web interface of PPS (CVE-2019-11543, CVE-2019-11542, CVE-2019-11539, CVE-2019-11509) - Multiple vulnerabilities found in Network File Share (NFS) of PPS , allows the attacker to read/write arbitrary files on the affected device. (CVE-2019-11538, CVE-2019-11508) Refer to the vendor advisory for additional information. last seen 2020-06-01 modified 2020-06-02 plugin id 124767 published 2019-05-10 reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/124767 title Pulse Policy Secure Multiple Vulnerabilities (SA44101) code # # (c) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(124767); script_version("1.7"); script_set_attribute(attribute:"plugin_modification_date", value:"2020/07/31"); script_cve_id( "CVE-2019-11509", "CVE-2019-11539", "CVE-2019-11540", "CVE-2019-11542", "CVE-2019-11543" ); script_bugtraq_id(108073); script_xref(name:"IAVA", value:"2019-A-0309-S"); script_xref(name:"IAVA", value:"0001-A-0001"); script_name(english:"Pulse Policy Secure Multiple Vulnerabilities (SA44101)"); script_summary(english:"Checks PPS version."); script_set_attribute(attribute:"synopsis", value: "The remote host is affected by multiple vulnerabilities."); script_set_attribute(attribute:"description", value: "According to its self-reported version, the version of Pulse Policy Secure running on the remote host is affected by multiple vulnerabilities. - A session hijacking vulnerability exists in PPS. An unauthenticated, remote attacker can exploit this, to perform actions in the user or administrator interface with the privileges of another user. (CVE-2019-11540) - Multiple vulnerabilities found in the admin web interface of PPS (CVE-2019-11543, CVE-2019-11542, CVE-2019-11539, CVE-2019-11509) - Multiple vulnerabilities found in Network File Share (NFS) of PPS , allows the attacker to read/write arbitrary files on the affected device. (CVE-2019-11538, CVE-2019-11508) Refer to the vendor advisory for additional information."); # https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44101 script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d23f9165"); script_set_attribute(attribute:"solution", value: "Upgrade to the appropriate version referenced in the advisory."); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P"); script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"); script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C"); script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-11540"); script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available"); script_set_attribute(attribute:"exploit_available", value:"true"); script_set_attribute(attribute:"metasploit_name", value:'Pulse Secure VPN Arbitrary Command Execution'); script_set_attribute(attribute:"exploit_framework_metasploit", value:"true"); script_set_attribute(attribute:"vuln_publication_date", value:"2019/05/09"); script_set_attribute(attribute:"patch_publication_date", value:"2019/05/09"); script_set_attribute(attribute:"plugin_publication_date", value:"2019/05/10"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"cpe:/a:pulse_secure:pulse_policy_secure"); script_set_attribute(attribute:"stig_severity", value:"I"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"Misc."); script_copyright(english:"This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("pulse_policy_secure_detect.nbin"); script_require_keys("installed_sw/Pulse Policy Secure"); exit(0); } include("vcf.inc"); app_info = vcf::get_app_info(app:'Pulse Policy Secure', port:443); constraints = [ {'min_version' : '5.1R1' , 'fixed_version' : '5.1R15.1'}, {'min_version' : '5.2R1' , 'fixed_version' : '5.2R12.1'}, {'min_version' : '5.3R1' , 'fixed_version' : '5.3R12.1'}, {'min_version' : '5.4R1' , 'fixed_version' : '5.4R7.1.'}, {'min_version' : '9.0R1' , 'fixed_version' : '9.0R3.2', 'display_version' : '9.0R3.2 / 9.0R4' } ]; vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_HOLE);
NASL family Misc. NASL id PULSE_CONNECT_SECURE-SA-44101.NASL description According to its self-reported version, the version of Pulse Connect Secure running on the remote host is affected by multiple vulnerabilities. - An arbitrary file read vulnerability exists in PCS. An unauthenticated, remote attacker can exploit this, via specially crafted URI, to read arbitrary files and disclose sensitive information. (CVE-2019-11510) - Multiple vulnerabilities are found in Ghostscript.(CVE-2018-16513 , CVE-2018-18284, CVE-2018-15911, CVE-2018-15910, CVE-2018-15909) - A session hijacking vulnerability exists in PCS. An unauthenticated, remote attacker can exploit this, to perform actions in the user or administrator interface with the privileges of another user. (CVE-2019-11540) - An authentication leaks seen in users using SAML authentication with the reuse existing NC (Pulse) session option. (CVE-2019-11541) - Multiple vulnerabilities found in the admin web interface of PCS. (CVE-2019-11543, CVE-2019-11542, CVE-2019-11509, CVE-2019-11539) - Multiple vulnerabilities found in Network File Share (NFS) of PCS , allows the attacker to read/write arbitrary files on the affected device. (CVE-2019-11538, CVE-2019-11508) - A cross-site scripting (XSS) vulnerability exists in application launcher page due to improper validation of user-supplied input before returning it to users. An attacker can exploit this, by convincing a user to click a specially crafted URL, to execute arbitrary script code in a user last seen 2020-06-01 modified 2020-06-02 plugin id 124766 published 2019-05-10 reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/124766 title Pulse Connect Secure Multiple Vulnerabilities (SA44101)
Packetstorm
data source https://packetstormsecurity.com/files/download/154376/pulsesecuresslvpn-exec.txt id PACKETSTORM:154376 last seen 2019-09-07 published 2019-09-06 reporter Alyssa Herrera source https://packetstormsecurity.com/files/154376/Pulse-Secure-8.1R15.1-8.2-8.3-9.0-SSL-VPN-Remote-Code-Execution.html title Pulse Secure 8.1R15.1 / 8.2 / 8.3 / 9.0 SSL VPN Remote Code Execution data source https://packetstormsecurity.com/files/download/155277/pulse_secure_cmd_exec.rb.txt id PACKETSTORM:155277 last seen 2019-11-14 published 2019-11-12 reporter Orange Tsai source https://packetstormsecurity.com/files/155277/Pulse-Secure-VPN-Arbitrary-Command-Execution.html title Pulse Secure VPN Arbitrary Command Execution
References
- http://packetstormsecurity.com/files/154376/Pulse-Secure-8.1R15.1-8.2-8.3-9.0-SSL-VPN-Remote-Code-Execution.html
- http://packetstormsecurity.com/files/154376/Pulse-Secure-8.1R15.1-8.2-8.3-9.0-SSL-VPN-Remote-Code-Execution.html
- http://packetstormsecurity.com/files/155277/Pulse-Secure-VPN-Arbitrary-Command-Execution.html
- http://packetstormsecurity.com/files/155277/Pulse-Secure-VPN-Arbitrary-Command-Execution.html
- http://packetstormsecurity.com/files/162092/Pulse-Secure-VPN-Arbitrary-Command-Execution.html
- http://packetstormsecurity.com/files/162092/Pulse-Secure-VPN-Arbitrary-Command-Execution.html
- http://www.securityfocus.com/bid/108073
- http://www.securityfocus.com/bid/108073
- https://devco.re/blog/2019/09/02/attacking-ssl-vpn-part-3-the-golden-Pulse-Secure-ssl-vpn-rce-chain-with-Twitter-as-case-study/
- https://devco.re/blog/2019/09/02/attacking-ssl-vpn-part-3-the-golden-Pulse-Secure-ssl-vpn-rce-chain-with-Twitter-as-case-study/
- https://i.blackhat.com/USA-19/Wednesday/us-19-Tsai-Infiltrating-Corporate-Intranet-Like-NSA.pdf
- https://i.blackhat.com/USA-19/Wednesday/us-19-Tsai-Infiltrating-Corporate-Intranet-Like-NSA.pdf
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44101
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44101
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0010
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0010
- https://www.kb.cert.org/vuls/id/927237
- https://www.kb.cert.org/vuls/id/927237