CWE-130 长度参数不一致性处理不恰当

Improper Handling of Length Parameter Inconsistency

结构: Simple

Abstraction: Base

状态: Incomplete

被利用可能性: unkown

基本描述

The software parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data.

扩展描述

If an attacker can manipulate the length parameter associated with an input such that it is inconsistent with the actual length of the input, this can be leveraged to cause the target application to behave in unexpected, and possibly, malicious ways. One of the possible motives for doing so is to pass in arbitrarily large input to the application. Another possible motivation is the modification of application state by including invalid data for subsequent properties of the application. Such weaknesses commonly lead to attacks such as buffer overflows and execution of arbitrary code.

相关缺陷

  • cwe_Nature: ChildOf cwe_CWE_ID: 240 cwe_View_ID: 1000 cwe_Ordinal: Primary

  • cwe_Nature: ChildOf cwe_CWE_ID: 119 cwe_View_ID: 699 cwe_Ordinal: Primary

  • cwe_Nature: CanPrecede cwe_CWE_ID: 805 cwe_View_ID: 1000

适用平台

Language: [{'cwe_Name': 'C', 'cwe_Prevalence': 'Sometimes'}, {'cwe_Name': 'C++', 'cwe_Prevalence': 'Sometimes'}, {'cwe_Class': 'Language-Independent', 'cwe_Prevalence': 'Undetermined'}]

常见的影响

范围 影响 注释
Other Varies by Context

可能的缓解方案

Implementation

策略:

When processing structured incoming data containing a size field followed by raw data, ensure that you identify and resolve any inconsistencies between the size field and the actual size of the data.

Implementation

策略:

Do not let the user control the size of the buffer.

Implementation

策略:

Validate that the length of the user-supplied data is consistent with the buffer size.

示例代码

例

In the following C/C++ example the method processMessageFromSocket() will get a message from a socket, placed into a buffer, and will parse the contents of the buffer into a structure that contains the message length and the message body. A for loop is used to copy the message body into a local character string which will be passed to another method for processing.

bad C

int processMessageFromSocket(int socket) {
int success;

char buffer[BUFFER_SIZE];
char message[MESSAGE_SIZE];

// get message from socket and store into buffer

//Ignoring possibliity that buffer > BUFFER_SIZE
if (getMessage(socket, buffer, BUFFER_SIZE) > 0) {

// place contents of the buffer into message structure
ExMessage *msg = recastBuffer(buffer);

// copy message body into string for processing
int index;
for (index = 0; index < msg->msgLength; index++) {
message[index] = msg->msgBody[index];
}
message[index] = '\0';

// process message
success = processMessage(message);
}
return success;
}

However, the message length variable from the structure is used as the condition for ending the for loop without validating that the message length variable accurately reflects the length of message body. This can result in a buffer over read by reading from memory beyond the bounds of the buffer if the message length variable indicates a length that is longer than the size of a message body (CWE-130).

分析过的案例

标识 说明 链接
CVE-2014-0160 Chain: "Heartbleed" bug receives an inconsistent length parameter (CWE-130) enabling an out-of-bounds read (CWE-126), returning memory that could include private cryptographic keys and other sensitive data. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-0160
CVE-2009-2299 Web application firewall consumes excessive memory when an HTTP request contains a large Content-Length value but no POST data. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2299
CVE-2001-0825 Buffer overflow in internal string handling routine allows remote attackers to execute arbitrary commands via a length argument of zero or less, which disables the length check. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2001-0825
CVE-2001-1186 Web server allows remote attackers to cause a denial of service via an HTTP request with a content-length value that is larger than the size of the request, which prevents server from timing out the connection. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2001-1186
CVE-2001-0191 Service does not properly check the specified length of a cookie, which allows remote attackers to execute arbitrary commands via a buffer overflow, or brute force authentication by using a short cookie length. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2001-0191
CVE-2003-0429 Traffic analyzer allows remote attackers to cause a denial of service and possibly execute arbitrary code via invalid IPv4 or IPv6 prefix lengths, possibly triggering a buffer overflow. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2003-0429
CVE-2000-0655 Chat client allows remote attackers to cause a denial of service or execute arbitrary commands via a JPEG image containing a comment with an illegal field length of 1. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2000-0655
CVE-2004-0492 Server allows remote attackers to cause a denial of service and possibly execute arbitrary code via a negative Content-Length HTTP header field causing a heap-based buffer overflow. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0492
CVE-2004-0201 Help program allows remote attackers to execute arbitrary commands via a heap-based buffer overflow caused by a .CHM file with a large length field https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0201
CVE-2003-0825 Name services does not properly validate the length of certain packets, which allows attackers to cause a denial of service and possibly execute arbitrary code. Can overlap zero-length issues https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2003-0825
CVE-2004-0095 Policy manager allows remote attackers to cause a denial of service (memory consumption and crash) and possibly execute arbitrary code via an HTTP POST request with an invalid Content-Length value. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0095
CVE-2004-0826 Heap-based buffer overflow in library allows remote attackers to execute arbitrary code via a modified record length field in an SSLv2 client hello message. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0826
CVE-2004-0808 When domain logons are enabled, server allows remote attackers to cause a denial of service via a SAM_UAS_CHANGE request with a length value that is larger than the number of structures that are provided. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0808
CVE-2002-1357 Multiple SSH2 servers and clients do not properly handle packets or data elements with incorrect length specifiers, which may allow remote attackers to cause a denial of service or possibly execute arbitrary code. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-1357
CVE-2004-0774 Server allows remote attackers to cause a denial of service (CPU and memory exhaustion) via a POST request with a Content-Length header set to -1. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0774
CVE-2004-0989 Multiple buffer overflows in xml library that may allow remote attackers to execute arbitrary code via long URLs. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0989
CVE-2004-0568 Application does not properly validate the length of a value that is saved in a session file, which allows remote attackers to execute arbitrary code via a malicious session file (.ht), web site, or Telnet URL contained in an e-mail message, triggering a buffer overflow. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0568
CVE-2003-0327 Server allows remote attackers to cause a denial of service via a remote password array with an invalid length, which triggers a heap-based buffer overflow. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2003-0327
CVE-2003-0345 Product allows remote attackers to cause a denial of service and possibly execute arbitrary code via an SMB packet that specifies a smaller buffer length than is required. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2003-0345
CVE-2004-0430 Server allows remote attackers to execute arbitrary code via a LoginExt packet for a Cleartext Password User Authentication Method (UAM) request with a PathName argument that includes an AFPName type string that is longer than the associated length field. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0430
CVE-2005-0064 PDF viewer allows remote attackers to execute arbitrary code via a PDF file with a large /Encrypt /Length keyLength value. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-0064
CVE-2004-0413 SVN client trusts the length field of SVN protocol URL strings, which allows remote attackers to cause a denial of service and possibly execute arbitrary code via an integer overflow that leads to a heap-based buffer overflow. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0413
CVE-2004-0940 Is effectively an accidental double increment of a counter that prevents a length check conditional from exiting a loop. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0940
CVE-2002-1235 Length field of a request not verified. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-1235
CVE-2005-3184 Buffer overflow by modifying a length value. https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3184
SECUNIA:18747 Length field inconsistency crashes cell phone. http://secunia.com/advisories/18747/

Notes

分类映射

映射的分类名 ImNode ID Fit Mapped Node Name
PLOVER Length Parameter Inconsistency

相关攻击模式

  • CAPEC-47