Linux Kernel up to 4.14.11 net/ipv6/tcp_ipv6.c tcp_v6_syn_recv_sock out-of-bounds write

Summaryinfo

A vulnerability categorized as critical has been discovered in Linux Kernel up to 4.14.11. This issue affects the function tcp_v6_syn_recv_sock of the file net/ipv6/tcp_ipv6.c. Such manipulation leads to out-of-bounds write. This vulnerability is documented as CVE-2018-5703. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.14.11 (Operating System). It has been rated as critical. Affected by this issue is the function tcp_v6_syn_recv_sock of the file net/ipv6/tcp_ipv6.c. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes:

The tcp_v6_syn_recv_sock function in net/ipv6/tcp_ipv6.c in the Linux kernel through 4.14.11 allows attackers to cause a denial of service (slab out-of-bounds write) or possibly have unspecified other impact via vectors involving TLS.

The bug was discovered 01/03/2018. The weakness was released 01/16/2018 (Website). The advisory is shared for download at groups.google.com. This vulnerability is handled as CVE-2018-5703 since 01/16/2018. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 13 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 108307 (Fedora 27 : kernel (2018-2bce10900e)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 277237 (Fedora Security Update for kernel (FEDORA-2018-2bce10900e)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (108307). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 4.14.0
• 4.14.1
• 4.14.2
• 4.14.3
• 4.14.4
• 4.14.5
• 4.14.6
• 4.14.7
• 4.14.8
• 4.14.9
• 4.14.10
• 4.14.11

License

• open-source

Website

• Vendor: https://www.kernel.org/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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