Description Preview
SLnet.exe in SeattleLab SLNet RF Telnet Server versions 4.1.1.3758 and earlier contains a vulnerability that allows remote, user-assisted attackers to cause a crash by sending specific Telnet options. This triggers a NULL pointer dereference, resulting in a denial of service. Note that the crash is not user-assisted when the server is running in debug mode.
Overview
This CVE describes a denial-of-service vulnerability in the SeattleLab SLNet RF Telnet Server, affecting SLnet.exe versions up to 4.1.1.3758 and earlier. The issue arises from how certain Telnet options are processed, which can lead to a NULL pointer dereference and a crash. In production, arbitrary remote attackers can exploit this to disrupt service, while the crash behavior changes when the server is operating in debug mode.
Remediation
- Check with the vendor for a patched, fixed version of SeattleLab SLNet RF Telnet Server and upgrade to the latest release that addresses this vulnerability.
- If no patch is available, mitigate by removing or disabling the Telnet server from production, or replace it with a more secure remote access method (e.g., SSH) and restrict Telnet usage to tightly controlled management networks.
- Implement network controls: deny or tightly restrict Telnet traffic to the server (firewalls, ACLs), and limit access to trusted hosts only.
- Enable monitoring and logging for Telnet negotiation activity to detect anomalous option handling attempts; consider applying intrusion detection rules for Telnet traffic.
- Do not rely on debug mode as a mitigation in production; treat it as a diagnostic mode and pursue official fixes or deprecation/remediation of the affected service.
References
Industry ExposureMost to leastThis section illustrates the prevalence of a specific Common Vulnerabilities and Exposures (CVE) across various industries based on customer reports. The ranking displays industries from the most to least affected by this particular vulnerability, offering valuable insight into where this CVE has been most frequently observed. This information can help organizations within these sectors prioritize their security efforts, understand their relative risk exposure compared to their peers, and focus remediation strategies where they are most needed. By understanding the industry-specific impact, organizations can make more informed decisions regarding patching, resource allocation, and overall risk management related to this CVE.
This section illustrates the prevalence of a specific Common Vulnerabilities and Exposures (CVE) across various industries based on customer reports. The ranking displays industries from the most to least affected by this particular vulnerability, offering valuable insight into where this CVE has been most frequently observed. This information can help organizations within these sectors prioritize their security efforts, understand their relative risk exposure compared to their peers, and focus remediation strategies where they are most needed. By understanding the industry-specific impact, organizations can make more informed decisions regarding patching, resource allocation, and overall risk management related to this CVE.
- Accommodation & Food ServicesAccommodation & Food Services: Low
- Administrative, Support, Waste Management & Remediation ServicesAdministrative, Support, Waste Management & Remediation Services: Low
- Agriculture, Forestry Fishing & HuntingAgriculture, Forestry Fishing & Hunting: Low
- Arts, Entertainment & RecreationArts, Entertainment & Recreation: Low
- ConstructionConstruction: Low
- Educational ServicesEducational Services: Low
- Finance and InsuranceFinance and Insurance: Low
- Health Care & Social AssistanceHealth Care & Social Assistance: Low
- InformationInformation: Low
- Management of Companies & EnterprisesManagement of Companies & Enterprises: Low
- ManufacturingManufacturing: Low
- MiningMining: Low
- Other Services (except Public Administration)Other Services (except Public Administration): Low
- Professional, Scientific, & Technical ServicesProfessional, Scientific, & Technical Services: Low
- Public AdministrationPublic Administration: Low
- Real Estate Rental & LeasingReal Estate Rental & Leasing: Low
- Retail TradeRetail Trade: Low
- Transportation & WarehousingTransportation & Warehousing: Low
- UtilitiesUtilities: Low
- Wholesale TradeWholesale Trade: Low
