CVE-2023-49284 : Exploit Details and Defense Strategies
CVE-2023-49284: fish shell vulnerability allows triggering shell expansion through command substitution output, posing risk of denial of service or information disclosure. Upgrade to version 3.6.2 for protection.
A vulnerability has been identified in the fish shell that could allow an attacker to trigger shell expansion through command substitution output. This CVE, assigned a low CVSS base score of 3.9, poses a potential risk of denial of service or information disclosure.
Understanding CVE-2023-49284
This section provides detailed insights into the nature of the vulnerability and its impact.
What is CVE-2023-49284?
The fish shell, a popular command line shell, mishandles Unicode non-characters used for wildcards and expansions. This flaw allows markers to be read in command substitution output without proper transformation, potentially leading to unexpected behavior or minor security issues.
The Impact of CVE-2023-49284
While code execution is unlikely, the vulnerability could result in denial of service via large brace expansion or information disclosure through variable expansion in certain scenarios.
Technical Details of CVE-2023-49284
Explore the specific technical aspects of this CVE.
Vulnerability Description
The vulnerability stems from a design flaw in the fish shell that allows markers used for wildcards and expansions to be read in command substitution output. This flaw has existed in fish shell for over 15 years.
Affected Systems and Versions
The vulnerability affects fish shell versions prior to 3.6.2. Users with versions below this are at risk of exploitation.
Exploitation Mechanism
By feeding command substitution output from an external program, an attacker could exploit the vulnerability to trigger shell expansion.
Mitigation and Prevention
Learn how to protect your systems from CVE-2023-49284.
Immediate Steps to Take
To mitigate the risk, users are strongly advised to upgrade to fish shell version 3.6.2 or newer. No known workarounds are available for this vulnerability.
Long-Term Security Practices
Ensure regular software updates and follow security best practices to safeguard against potential vulnerabilities.
Patching and Updates
Stay informed about security patches and updates for fish shell to address known vulnerabilities and enhance system security.