Platform
Managed Security Services
Managed Penetration Testing
Rewterz penetration testing services help organizations determine if a cyber attacker can gain access to their critical assets while giving them detailed insights of the overall business impact of a cyber attack.
Resources
March 21, 2023Severity Medium Analysis Summary Rhadamanthys is a type of malware known as a stealer, which is designed to steal sensitive information from infected computers. It was […]March 21, 2023Severity High Analysis Summary The Mirai botnet is a type of malware that infects Internet of Things (IoT) devices, such as routers, security cameras, and other […]March 21, 2023Severity High Analysis Summary LockBit ransomware takes as little as five minutes to deploy the encryption routine on target systems once it lands on the victim […]Threat Insights
Before Rewterz got its start, the market was in dire need of a specialized and dedicated information security company. It was nearly impossible for businesses to find a trustworthy provider that could truly cover all of their bases. We wanted to meet this need, giving companies across the globe a chance to get ahead while knowing that their data is in good hands.
Connect with Us
Platform
Managed Security Services
Managed Penetration Testing
Rewterz penetration testing services help organizations determine if a cyber attacker can gain access to their critical assets while giving them detailed insights of the overall business impact of a cyber attack.
Resources
March 21, 2023Severity Medium Analysis Summary Rhadamanthys is a type of malware known as a stealer, which is designed to steal sensitive information from infected computers. It was […]March 21, 2023Severity High Analysis Summary The Mirai botnet is a type of malware that infects Internet of Things (IoT) devices, such as routers, security cameras, and other […]March 21, 2023Severity High Analysis Summary LockBit ransomware takes as little as five minutes to deploy the encryption routine on target systems once it lands on the victim […]Threat Insights
Before Rewterz got its start, the market was in dire need of a specialized and dedicated information security company. It was nearly impossible for businesses to find a trustworthy provider that could truly cover all of their bases. We wanted to meet this need, giving companies across the globe a chance to get ahead while knowing that their data is in good hands.
Connect with Us
Rewterz Threat Advisory – Microsoft Windows ‘SchRpcSetSecurity()’ Privilege Escalation Vulnerability
August 29, 2018Rewterz Threat Advisory – Exploitation of automatic DNS registration and auto-discovery
September 6, 2018
A vulnerability in Linux Kernel, that can be exploited by people with malicious intent to cause a Denial of Service, has been patched.
IMPACT: MEDIUM
PUBLISH DATE: 06-09-2018
OVERVIEW
An error within the “cipso_v4_optptr()” function (net/ipv4/cipso_ipv4.c) of the Linux Kernel can be exploited to trigger an infinite loop. This leads to a Denial of Service, withholding an organization’s availability. The vulnerability has been patched in a recent update.
ANALYSIS
A flaw was found in the Linux kernel present since v4.0-rc1 and through v4.13-rc4. An attacker may force the kernel to enter an infinite loop in the cipso_v4_optptr() function in net/ipv4/cipso_ipv4.c by remotely sending a crafted network package. This leads to a denial-of-service.
An attacker needs to set up a certain non-default configuration of LSM (Linux Security Module) and NetLabel on a system in order to leverage this flaw. All the kernels with the cipso_v4_optptr() function which have not backported the upstream commit 40413955ee26 are vulnerable.
This attack is launched via network and may put an organization’s availability at stake if Denial of Service is successful. To combat this vulnerability, updates have been released by the vendor.
AFFECTED PRODUCTS
The vulnerability is reported in versions prior to 4.4.154 and prior to 4.9.125 along with some others.
• The Linux Kernel 4.4.x
• Linux Kernel 4.9.x
• Linux Kernel 4.0.5
• Linux Kernel 4.13
UPDATES
Update to version 4.4.154 or 4.9.125.