SB2020102601 - Remote DoS in TCP/IP implementation in Fujitsu M10 servers

Description

This security bulletin contains information about 1 security vulnerability.

1) Integer overflow (CVE-ID: CVE-2019-11477)

The vulnerability allows a remote attacker to perform denial of service (DoS) attack.

The vulnerability exists due to integer overflow when handling TCP Selective Acknowledgments (SACKs) due to incorrect processing of TCP_SKB_CB(skb)->tcp_gso_segs value in Linux kernel. A remote non-authenticated attacker can send specially crafted network traffic to the affected system, trigger integer overflow and render the system unavailable.

Successful exploitation of the vulnerability allows a remote attacker to perform denial of service (DoS) attack.

Remediation

Install update from vendor's website.

References

• https://www.oracle.com/security-alerts/cpuoct2020.html