Cloud Vulnerability DB
An open project to list all known cloud vulnerabilities and Cloud Service Provider security issues
Vulnerability DatabaseCVE-2023-52778
CVE-2023-52778:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2023-52778 affects the MPTCP (Multipath TCP) implementation in the Linux kernel. The vulnerability was discovered when TCP sockets and MPTCP subflows could build egress packets larger than 64K, which exceeds the maximum DSS (Data Sequence Signal) data size. This issue was identified on November 14, 2023, and affects systems using MPTCP networking capabilities (Kernel Commit).
Technical details
The vulnerability stems from a previous commit (7c4e983c4f3c) that allowed gsomaxsize to exceed 65536 bytes. When packets exceed the maximum DSS data size, the length is misrepresented on the wire, leading to stream corruption. The issue manifests in the MPTCP protocol implementation, specifically in the net/mptcp/protocol.c file, where packet sizes were not properly bounded to MPTCP's limitations (Kernel Commit).
Impact
When exploited, this vulnerability can cause stream corruption and trigger kernel warnings. The issue affects the data integrity of MPTCP connections and can lead to system warnings such as 'WARNING: CPU: 0 PID: 9696 at net/mptcp/protocol.c:705' (Kernel Commit).
Mitigation and workarounds
The issue has been fixed by explicitly bounding the maximum GSO size to what MPTCP actually allows. The fix introduces a MPTCPMAXGSOSIZE definition and adds checks to ensure the skgsomaxsize does not exceed this limit (Kernel Commit).
Additional resources
Source: This report was generated using AI
Free Vulnerability Assessment
Benchmark your Cloud Security Posture
Evaluate your cloud security practices across 9 security domains to benchmark your risk level and identify gaps in your defenses.
Get a personalized demo
Ready to see Wiz in action?
“Best User Experience I have ever seen, provides full visibility to cloud workloads.”
David EstlickCISO
“Wiz provides a single pane of glass to see what is going on in our cloud environments.”
Adam FletcherChief Security Officer
“We know that if Wiz identifies something as critical, it actually is.”
Greg PoniatowskiHead of Threat and Vulnerability Management