Vulnerabilities > CVE-2011-4968 - Improper Input Validation vulnerability in multiple products

047910
CVSS 5.8 - MEDIUM
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
PARTIAL
Availability impact
NONE

Summary

nginx http proxy module does not verify peer identity of https origin server which could facilitate man-in-the-middle attack (MITM)

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.

Seebug

bulletinFamilyexploit
descriptionBugtraq ID:57139 CVE ID:CVE-2011-4968 nginx是一款高性能的web服务器,使用非常广泛,其不仅经常被用作反向代理,也可以非常好的支持PHP的运行 nginx包含的Http代理模块允许通过https与源服务器通信,但是没有正确校验源服务器身份,允许攻击者在代理和源服务器之间进行中间人攻击 0 Igor Sysoev nginx 0.8.40 Igor Sysoev nginx 0.8.36 Igor Sysoev nginx 0.8.35 Igor Sysoev nginx 0.8.33 Igor Sysoev nginx 0.7.66 Igor Sysoev nginx 0.7.65 Igor Sysoev nginx 0.7.64 Igor Sysoev nginx 0.7.62 Igor Sysoev nginx 0.7.61 厂商解决方案 用户可参考如下厂商提供的安全公告获得补丁信息: http://mailman.nginx.org/pipermail/nginx-devel/2011-September/001182.html
idSSV:60559
last seen2017-11-19
modified2013-01-05
published2013-01-05
reporterRoot
titlenginx 中间人攻击漏洞(CVE-2011-4968)