CVE-2022-24903 : Security Advisory and Response

A buffer overflow vulnerability has been identified in the TCP syslog server (receiver) components in rsyslog, potentially leading to system malfunction. While remote code execution is unlikely, caution is advised.

Understanding CVE-2022-24903

This CVE involves a heap buffer overflow in the TCP syslog server components in rsyslog, affecting versions below 8.2204.1.

What is CVE-2022-24903?

Rsyslog, a log processing system, is susceptible to a heap buffer overflow when octet-counted framing is used. This can result in a system malfunction or a segfault, potentially enabling exploitation by experts.

The Impact of CVE-2022-24903

Although unlikely for remote code execution, this vulnerability poses a risk of memory buffer overrun, leading to system malfunctions and segfaults. Precautionary measures are advised.

Technical Details of CVE-2022-24903

Vulnerability Description

The vulnerability arises when octet counts exceed the maximum, causing digits to be written to a heap buffer, potentially leading to buffer overflow and memory corruption.

Affected Systems and Versions

Vendor 'rsyslog' and product 'rsyslog' versions below 8.2204.1 are impacted by this vulnerability.

Exploitation Mechanism

The vulnerability can be exploited by manipulating octet counts in TCP syslog reception, enabling attackers to overrun memory buffers.

Mitigation and Prevention

Immediate Steps to Take

To mitigate the risk, it is advised to disable octet-counted framing for critical modules such as

imtcp

and

imptcp

if not essential. Avoid direct exposure to the public.

Long-Term Security Practices

Regularly monitor vendor advisories and security updates to stay informed about patches and recommended security practices.

Patching and Updates

Apply the latest updates provided by rsyslog to address the buffer overflow vulnerability and enhance system security.