CWE-291 信任自主报告的IP地址

Reliance on IP Address for Authentication

结构: Simple

Abstraction: Variant

状态: Incomplete

被利用可能性: High

基本描述

The software uses an IP address for authentication.

扩展描述

IP addresses can be easily spoofed. Attackers can forge the source IP address of the packets they send, but response packets will return to the forged IP address. To see the response packets, the attacker has to sniff the traffic between the victim machine and the forged IP address. In order to accomplish the required sniffing, attackers typically attempt to locate themselves on the same subnet as the victim machine. Attackers may be able to circumvent this requirement by using source routing, but source routing is disabled across much of the Internet today. In summary, IP address verification can be a useful part of an authentication scheme, but it should not be the single factor required for authentication.

相关缺陷

  • cwe_Nature: ChildOf cwe_CWE_ID: 290 cwe_View_ID: 1000 cwe_Ordinal: Primary

  • cwe_Nature: ChildOf cwe_CWE_ID: 290 cwe_View_ID: 699 cwe_Ordinal: Primary

  • cwe_Nature: ChildOf cwe_CWE_ID: 923 cwe_View_ID: 1000

  • cwe_Nature: ChildOf cwe_CWE_ID: 471 cwe_View_ID: 1000

适用平台

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

常见的影响

范围 影响 注释
['Access Control', 'Non-Repudiation'] ['Hide Activities', 'Gain Privileges or Assume Identity'] Malicious users can fake authentication information, impersonating any IP address.

可能的缓解方案

Architecture and Design

策略:

Use other means of identity verification that cannot be simply spoofed. Possibilities include a username/password or certificate.

示例代码

例

Both of these examples check if a request is from a trusted address before responding to the request.

bad C

sd = socket(AF_INET, SOCK_DGRAM, 0);
serv.sin_family = AF_INET;
serv.sin_addr.s_addr = htonl(INADDR_ANY);
servr.sin_port = htons(1008);
bind(sd, (struct sockaddr ) & serv, sizeof(serv));

while (1) {
memset(msg, 0x0, MAX_MSG);
clilen = sizeof(cli);
if (inet_ntoa(cli.sin_addr)==getTrustedAddress()) {
n = recvfrom(sd, msg, MAX_MSG, 0, (struct sockaddr ) & cli, &clilen);
}
}

bad Java

while(true) {
DatagramPacket rp=new DatagramPacket(rData,rData.length);
outSock.receive(rp);
String in = new String(p.getData(),0, rp.getLength());
InetAddress clientIPAddress = rp.getAddress();
int port = rp.getPort();

if (isTrustedAddress(clientIPAddress) & secretKey.equals(in)) {
out = secret.getBytes();
DatagramPacket sp =new DatagramPacket(out,out.length, IPAddress, port); outSock.send(sp);
}
}

The code only verifies the address as stored in the request packet. An attacker can spoof this address, thus impersonating a trusted client.

分类映射

映射的分类名 ImNode ID Fit Mapped Node Name
CLASP Trusting self-reported IP address

相关攻击模式

  • CAPEC-4