Integer overflow in Oracle Communications Subscriber-Aware Load Balancer

1) Integer overflow

EUVDB-ID: #VU18813

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-11477

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Oracle Communications Subscriber-Aware Load Balancer: 7.3 - 8.3

CPE2.3

• cpe:2.3:a:oracle:subscriber-aware_load_balancer:7.3:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:subscriber-aware_load_balancer:8.1:*:*:*:*:*:*:*
• cpe:2.3:a:oracle:subscriber-aware_load_balancer:8.3:*:*:*:*:*:*:*

External links

https://www.oracle.com/security-alerts/cpujan2020.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.