Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 5.0.10. This affects the function tcp_ack_update_rtt of the file net/ipv4/sysctl_net_ipv4.c. This manipulation causes integer overflow. The identification of this vulnerability is CVE-2019-18805. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 5.0.10 (Operating System) and classified as critical. Affected by this vulnerability is the function tcp_ack_update_rtt of the file net/ipv4/sysctl_net_ipv4.c. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in net/ipv4/sysctl_net_ipv4.c in the Linux kernel before 5.0.11. There is a net/ipv4/tcp_input.c signed integer overflow in tcp_ack_update_rtt() when userspace writes a very large integer to /proc/sys/net/ipv4/tcp_min_rtt_wlen, leading to a denial of service or possibly unspecified other impact, aka CID-19fad20d15a6.

The weakness was shared 11/07/2019. This vulnerability is known as CVE-2019-18805 since 11/07/2019. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 208605 (CentOS 7 : kernel-alt (RHSA-2020:0740)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.0.11 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (208605). The entries VDB-145223, VDB-145222, VDB-145221 and VDB-145220 are related to this item. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.0.0
• 5.0.1
• 5.0.2
• 5.0.3
• 5.0.4
• 5.0.5
• 5.0.6
• 5.0.7
• 5.0.8
• 5.0.9
• 5.0.10

License

• open-source

Website

• Vendor: https://www.kernel.org/

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