Npcap 1.88

Here are recurring questions and related user issues concerning Npcap, focusing on known security problems and breaches:

1. Are there any known vulnerabilities in Npcap that could lead to privilege escalation?

Yes, CVE-2019-11490 is a known vulnerability affecting Npcap version 0.992. It involves kernel pool corruption caused by processing malformed .pcap files. Exploiting this vulnerability can potentially allow an attacker to execute arbitrary code with kernel privileges, resulting in privilege escalation.

Details at NIST

2. Can malicious software exploit Npcap to capture network data without user consent?

Npcap runs as a Windows driver and remains active even if no applications like Wireshark are currently using it. This persistent presence can potentially be exploited by malicious software to capture network traffic covertly. Users have expressed the need for stricter control over Npcap's operational state to prevent unauthorized data capture.

Discussion on Wireshark Forum

3. Does Npcap conflict with VPN software, causing network disruptions?

Yes, conflicts have been reported between Npcap and VPN software like Cisco AnyConnect, causing network disruptions due to adapter interactions. A recommended solution includes unbinding Npcap from affected VPN adapters to prevent these disruptions.

Issue on GitHub

4. Has Npcap been associated with system instability or crashes?

Certain Npcap versions (notably 1.60 and 1.78) have been reported to cause system instability or crashes, including Blue Screen of Death (BSOD) errors, particularly associated with the function pcap_sendqueue_transmit. Later versions, such as 1.70, have attempted to address these issues.

Reported on GitHub Issue #601
Reported on GitHub Issue #755

5. Are there concerns regarding Npcap's auto-update mechanism affecting system operations?

Npcap's auto-update mechanism has caused compatibility issues with other software, such as sensors used in security applications. These automatic updates can disrupt operations, prompting users to request better control over update deployment.

Microsoft Tech Community Discussion

6. Can security software mistakenly identify Npcap components as threats?

Yes, security software, such as Sophos Intercept X, has occasionally flagged components of Npcap as potential threats (e.g., CheckStatus.bat flagged as a credential theft attempt). Although these detections are often false positives, they may require adjusting security software settings to mitigate recurring alerts.

Sophos Community Discussion