https://feed.craftedsignal.io/products/d-link-dir-513/Trending threats, MITRE ATT&CK coverage, and detection metadata. Fed continuously.Hugoenhello@craftedsignal.iohello@craftedsignal.ioFri, 26 Jan 2024 12:00:00 +0000https://feed.craftedsignal.io/briefs/2024-01-26-dlink-stack-overflow/Fri, 26 Jan 2024 12:00:00 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2024-01-26-dlink-stack-overflow/A stack-based buffer overflow vulnerability (CVE-2026-4555) exists in the formEasySetTimezone function of the /goform/formEasySetTimezone file within the boa component of D-Link DIR-513 1.10, allowing remote attackers to execute arbitrary code.CVE-2026-4555 describes a critical stack-based buffer overflow vulnerability affecting D-Link DIR-513 version 1.10. The vulnerability resides within the formEasySetTimezone function, specifically in the /goform/formEasySetTimezone file of the boa component. Attackers can exploit this flaw by manipulating the curTime argument, leading to arbitrary code execution. This vulnerability is remotely exploitable and has a publicly available exploit, increasing the risk of widespread attacks. Since D-Link DIR-513 is no longer supported, patching is not an option, making unpatched devices vulnerable. This lack of support and the ease of exploitation pose a significant threat to users who still operate these devices.

Attack Chain

1. The attacker identifies a vulnerable D-Link DIR-513 device running firmware version 1.10.
2. The attacker crafts a malicious HTTP request targeting the /goform/formEasySetTimezone endpoint.
3. The crafted request includes a specially crafted curTime argument designed to overflow the buffer.
4. The boa web server processes the request and calls the formEasySetTimezone function.
5. Due to insufficient input validation, the curTime argument overflows the stack buffer.
6. The overflow overwrites critical data on the stack, including the return address.
7. The attacker redirects control flow to a malicious payload injected within the overflow.
8. The payload executes arbitrary commands on the device, potentially granting the attacker full control.

Impact

Successful exploitation of CVE-2026-4555 allows remote attackers to execute arbitrary code on vulnerable D-Link DIR-513 devices. This could lead to complete device compromise, allowing attackers to modify device settings, eavesdrop on network traffic, or use the device as a bot in a larger botnet. Since the affected product is no longer supported, a patch is unlikely, leaving users with vulnerable devices exposed to potential attacks indefinitely. This can lead to significant security breaches and potential data compromise for home and small business users.

Recommendation

• Deploy the Sigma rule Detect D-Link DIR-513 Timezone Overflow Attempt to identify attempts to exploit CVE-2026-4555 via HTTP requests (logsource: webserver).
• Implement network segmentation to isolate vulnerable D-Link DIR-513 devices from critical network resources if immediate replacement is not feasible.
• Consider deploying a web application firewall (WAF) rule to block requests containing excessively long curTime parameters to mitigate exploit attempts (logsource: firewall).
• Monitor network traffic for unusual activity originating from D-Link DIR-513 devices, as this could indicate a compromised device performing malicious actions.

]]>criticaladvisorycvestack-overflowd-linknetwork-devicehttps://feed.craftedsignal.io/briefs/2024-01-dlink-buffer-overflow/Tue, 02 Jan 2024 12:00:00 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2024-01-dlink-buffer-overflow/A buffer overflow vulnerability exists in D-Link DIR-513 1.10 within the formSetPassword function of the /goform/formSetPassword POST Request Handler; successful exploitation via manipulation of the curTime argument could be achieved remotely, although the affected product is no longer supported.A buffer overflow vulnerability, CVE-2026-6012, has been identified in D-Link DIR-513 version 1.10. This vulnerability resides within the formSetPassword function of the /goform/formSetPassword component, specifically affecting the POST Request Handler. The vulnerability can be triggered by manipulating the curTime argument, leading to a buffer overflow condition. While a public exploit exists, it is important to note that the D-Link DIR-513 is no longer supported by the vendor. This vulnerability allows a remote attacker to potentially execute arbitrary code or cause a denial-of-service condition on the affected device. Given the end-of-life status of the device, patching is not a viable mitigation strategy.

Attack Chain

1. The attacker identifies a vulnerable D-Link DIR-513 device running firmware version 1.10.
2. The attacker crafts a malicious POST request targeting the /goform/formSetPassword endpoint.
3. Within the POST request, the attacker manipulates the curTime argument with a payload exceeding the expected buffer size.
4. The formSetPassword function processes the malicious POST request without proper bounds checking.
5. The oversized curTime argument overflows the allocated buffer, potentially overwriting adjacent memory regions.
6. The memory corruption leads to the execution of arbitrary code injected by the attacker.
7. The attacker gains control of the device, potentially gaining access to sensitive information or using the device as a bot in a larger attack.

Impact

Successful exploitation of this vulnerability could allow a remote attacker to execute arbitrary code on the affected D-Link DIR-513 device. Given the nature of the device, this could lead to unauthorized access to the network, data exfiltration, or the device being used as part of a botnet. While the device is no longer supported, there may still be vulnerable devices in operation, especially in home or small business networks.

Recommendation

• Deploy the Sigma rule Detect D-Link DIR-513 formSetPassword Buffer Overflow Attempt to detect exploitation attempts targeting the vulnerable endpoint (webserver logs).
• Implement network segmentation to isolate potentially vulnerable D-Link DIR-513 devices from critical network resources.
• Since the device is end-of-life, consider replacing the device with a supported and patched alternative to fully remediate the vulnerability.
• Monitor web server logs for POST requests to /goform/formSetPassword to identify potential exploitation attempts.

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