Vulnerabilities > CVE-2014-2127 - Improper Input Validation vulnerability in Cisco Adaptive Security Appliance Software
Attack vector
UNKNOWN Attack complexity
UNKNOWN Privileges required
UNKNOWN Confidentiality impact
UNKNOWN Integrity impact
UNKNOWN Availability impact
UNKNOWN Summary
Cisco Adaptive Security Appliance (ASA) Software 8.x before 8.2(5.48), 8.3 before 8.3(2.40), 8.4 before 8.4(7.9), 8.6 before 8.6(1.13), 9.0 before 9.0(4.1), and 9.1 before 9.1(4.3) does not properly process management-session information during privilege validation for SSL VPN portal connections, which allows remote authenticated users to gain privileges by establishing a Clientless SSL VPN session and entering crafted URLs, aka Bug ID CSCul70099.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Buffer Overflow via Environment Variables This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
- Server Side Include (SSI) Injection An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
- Cross Zone Scripting An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security. In a zone-based model, pages belong to one of a set of zones corresponding to the level of privilege assigned to that page. Pages in an untrusted zone would have a lesser level of access to the system and/or be restricted in the types of executable content it was allowed to invoke. In a cross-zone scripting attack, a page that should be assigned to a less privileged zone is granted the privileges of a more trusted zone. This can be accomplished by exploiting bugs in the browser, exploiting incorrect configuration in the zone controls, through a cross-site scripting attack that causes the attackers' content to be treated as coming from a more trusted page, or by leveraging some piece of system functionality that is accessible from both the trusted and less trusted zone. This attack differs from "Restful Privilege Escalation" in that the latter correlates to the inadequate securing of RESTful access methods (such as HTTP DELETE) on the server, while cross-zone scripting attacks the concept of security zones as implemented by a browser.
- Cross Site Scripting through Log Files An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
- 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.
Metasploit
| description | This module exploits a privilege escalation vulnerability for Cisco ASA SSL VPN (aka: WebVPN). It allows level 0 users to escalate to level 15. |
| id | MSF:AUXILIARY/SCANNER/HTTP/CISCO_SSL_VPN_PRIV_ESC |
| last seen | 2020-06-02 |
| modified | 2017-07-24 |
| published | 2014-07-08 |
| references | |
| reporter | Rapid7 |
| source | https://github.com/rapid7/metasploit-framework/blob/master//modules/auxiliary/scanner/http/cisco_ssl_vpn_priv_esc.rb |
| title | Cisco ASA SSL VPN Privilege Escalation Vulnerability |
Nessus
| NASL family | CISCO |
| NASL id | CISCO-SA-20140409-ASA.NASL |
| description | The remote Cisco ASA device is affected by one or more of the following vulnerabilities : - An issue exists in the Adaptive Security Device Manager (ADSM) due to improper privilege assignment to users with a privilege level of zero. This issue allows an authenticated, remote attacker to gain administrative privileges. (CVE-2014-2126) - An issue exists in the SSL VPN portal when the Clientless SSL VPN feature is used due to improper handling of management session information. An authenticated, remote attacker can exploit this to gain administrative privileges. (CVE-2014-2127) - An issue exists in the SSL VPN feature due to improper handling of authentication cookies. An unauthenticated, remote attacker can exploit this to bypass authentication, resulting in unauthorized access to internal network resources. (CVE-2014-2128) - An issue exists in the SIP inspection engine due to improper handling of SIP packets. An unauthenticated, remote attacker can exploit this to cause memory exhaustion, resulting in a denial of service. (CVE-2014-2129) Note that that the verification check for the presence of CVE-2014-2128 is a best effort approach and may result in potential false positives. |
| last seen | 2019-10-28 |
| modified | 2014-04-15 |
| plugin id | 73533 |
| published | 2014-04-15 |
| reporter | This script is Copyright (C) 2014-2018 Tenable Network Security, Inc. |
| source | https://www.tenable.com/plugins/nessus/73533 |
| title | Cisco ASA Software Multiple Vulnerabilities (cisco-sa-20140409-asa) |
| code | |
Seebug
| bulletinFamily | exploit |
| description | Bugtraq ID:66748 CVE ID:CVE-2014-2127 Cisco ASA 5500系列自适应安全设备是用于提供安全和VPN服务的模块化平台，可提供防火墙、IPS、anti-X和VPN服务。 Cisco Adaptive Security Appliance (ASA) Software 8.2(5.48)之前版本、8.3(2.40)之前版本、8.4(7.9)之前版本、8.6(1.13)之前版本、9.0(4.1)之前版本、9.1(4.3)之前版本在SSL VPN门户连接中的权限验证时，没有正确处理管理会话信息，这可使经过身份验证的远程用户通过建立无客户端SSL VPN会话并输入特制的URL，利用此漏洞获取权限。 0 Cisco Adaptive Security Appliance 9.x Cisco Adaptive Security Appliance 8.x 目前厂商已经发布了升级补丁以修复漏洞，请下载使用： http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140409-asa |
| id | SSV:62155 |
| last seen | 2017-11-19 |
| modified | 2014-04-14 |
| published | 2014-04-14 |
| reporter | Root |
| title | Cisco Adaptive Security Appliance SSL VPN远程权限提升漏洞 |