CVE-2021-3655: Linux kernel vulnerability in sctp_v6_to_sk_daddr
Summary
CVE-2021-3655: In sctp_v6_to_sk_daddr, sctp_v4_from_addr_param, and related functions of ipv6.c, protocol.c, and related files, there is a possible out of bounds read due to a missing bounds check. Affects :linux_kernel: versions >= :0, < :2022-03-05. Fixed in :2022-03-05. How to fix ↓
Also tracked for
- linux · Debian:11
The same CVE-2021-3655 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.
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Background
The Linux kernel is a critical component of the Linux operating system, responsible for managing system resources and facilitating communication between hardware and software components. It provides essential functionality for various devices, including servers, desktops, and mobile devices. The vulnerability identified as CVE-2021-3655 affects the Linux kernel's handling of SCTP (Stream Control Transmission Protocol) packets. SCTP is a transport layer protocol used for reliable, message-oriented communication between hosts. This vulnerability specifically impacts the handling of IPv6 addresses in the sctp_v6_to_sk_daddr, sctp_v4_from_addr_param, and related functions of ipv6.c, protocol.c, and related files.
Vulnerability Detail
The vulnerability arises from a missing bounds check in the mentioned functions, leading to a possible out-of-bounds read. An attacker positioned on the network path can exploit this flaw to disclose sensitive information remotely, without requiring any additional execution privileges. This vulnerability does not require user interaction for exploitation, making it particularly concerning. The absence of proper bounds checking allows an attacker to read beyond the intended memory region, potentially exposing sensitive data. The impact of this vulnerability can range from leaking network-related information to revealing potentially sensitive user data, depending on the specific context and data present in memory at the time of exploitation.
How To Fix
Minimum fixed version
:2022-03-05
This is the first release that contains the fix.
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Workaround
At present, there are no known workarounds specifically for this vulnerability. However, implementing general security best practices, such as network segmentation, access control, and intrusion detection systems, can help mitigate the risk of exploitation. It is crucial to prioritize the installation of the provided patches and updates to address the vulnerability effectively.
Conclusion
The identified vulnerability in the Linux kernel's handling of SCTP packets poses a significant risk of remote information disclosure. It is crucial to promptly update the affected Linux kernel versions with the provided patches to mitigate this vulnerability effectively. Additionally, implementing general security best practices and staying informed about the latest security updates are essential for maintaining a secure system. For further support and assistance in vulnerability remediation, please reach out to DevNack.com.
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FAQ
The vulnerability allows an attacker on the network path to read sensitive information remotely, potentially leading to the disclosure of network-related data or sensitive user information.
No, user interaction is not needed for exploitation. An attacker can exploit this vulnerability without any user involvement.
SCTP (Stream Control Transmission Protocol) is a transport layer protocol used for reliable, message-oriented communication between hosts.
No, the vulnerability affects specific versions of the Linux kernel. It is crucial to update to the fixed releases mentioned in the provided patches.
While there are no specific workarounds for this vulnerability, implementing general security best practices, such as network segmentation and access control, can help reduce the risk of exploitation.
References
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