CWE-82 Web页面IMG标签属性中脚本转义处理不恰当

Improper Neutralization of Script in Attributes of IMG Tags in a Web Page

结构: Simple

Abstraction: Variant

状态: Incomplete

被利用可能性: unkown

基本描述

The web application does not neutralize or incorrectly neutralizes scripting elements within attributes of HTML IMG tags, such as the src attribute.

扩展描述

Attackers can embed XSS exploits into the values for IMG attributes (e.g. SRC) that is streamed and then executed in a victim's browser. Note that when the page is loaded into a user's browsers, the exploit will automatically execute.

相关缺陷

• cwe_Nature: ChildOf cwe_CWE_ID: 83 cwe_View_ID: 1000 cwe_Ordinal: Primary

• cwe_Nature: ChildOf cwe_CWE_ID: 83 cwe_View_ID: 699 cwe_Ordinal: Primary

适用平台

Language: {'cwe_Class': 'Language-Independent', 'cwe_Prevalence': 'Undetermined'}

常见的影响

范围	影响	注释
['Confidentiality', 'Integrity', 'Availability']	['Read Application Data', 'Execute Unauthorized Code or Commands']

可能的缓解方案

MIT-30.1 Implementation

策略: Output Encoding

Use and specify an output encoding that can be handled by the downstream component that is reading the output. Common encodings include ISO-8859-1, UTF-7, and UTF-8. When an encoding is not specified, a downstream component may choose a different encoding, either by assuming a default encoding or automatically inferring which encoding is being used, which can be erroneous. When the encodings are inconsistent, the downstream component might treat some character or byte sequences as special, even if they are not special in the original encoding. Attackers might then be able to exploit this discrepancy and conduct injection attacks; they even might be able to bypass protection mechanisms that assume the original encoding is also being used by the downstream component.
The problem of inconsistent output encodings often arises in web pages. If an encoding is not specified in an HTTP header, web browsers often guess about which encoding is being used. This can open up the browser to subtle XSS attacks.

MIT-31 Implementation

策略: Attack Surface Reduction

To help mitigate XSS attacks against the user's session cookie, set the session cookie to be HttpOnly. In browsers that support the HttpOnly feature (such as more recent versions of Internet Explorer and Firefox), this attribute can prevent the user's session cookie from being accessible to malicious client-side scripts that use document.cookie. This is not a complete solution, since HttpOnly is not supported by all browsers. More importantly, XMLHTTPRequest and other powerful browser technologies provide read access to HTTP headers, including the Set-Cookie header in which the HttpOnly flag is set.

分析过的案例

标识	说明	链接
CVE-2006-3211	Stored XSS in a guestbook application using a javascript: URI in a bbcode img tag.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-3211
CVE-2002-1649	javascript URI scheme in IMG tag.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-1649
CVE-2002-1803	javascript URI scheme in IMG tag.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-1803
CVE-2002-1804	javascript URI scheme in IMG tag.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-1804
CVE-2002-1805	javascript URI scheme in IMG tag.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-1805
CVE-2002-1806	javascript URI scheme in IMG tag.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-1806
CVE-2002-1807	javascript URI scheme in IMG tag.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-1807
CVE-2002-1808	javascript URI scheme in IMG tag.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-1808

分类映射

映射的分类名	ImNode ID	Fit	Mapped Node Name
PLOVER			Script in IMG tags
Software Fault Patterns	SFP24		Tainted input to command

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