The CVE-2021-46848 vulnerability affects GNU Libtasn1 versions before 4.19.0 and is characterized by an ETYPE_OK off-by-one array size check. This vulnerability allows attackers to manipulate the encoding process, potentially leading to severe security implications.
With a CVSS score of 9.1, this vulnerability is classified as critical. It poses a significant risk to organizations using affected versions, particularly in networked environments. The vulnerability is marked as having a high potential for exploitation due to its low attack complexity and the absence of required privileges or user interaction.
Organizations should prioritize patching immediately. The urgency is underscored by the fact that the vulnerability is present in widely used software components, including Debian and Fedora distributions, which could allow for unauthorized access and further exploitation.
Currently, there are no known public exploits available, and it is not included in the Known Exploited Vulnerabilities (KEV) catalog. Nevertheless, the potential impact necessitates immediate attention from security teams.
Vulnerability Details
The official description of this vulnerability states that it affects GNU Libtasn1 versions prior to 4.19.0 and involves an off-by-one array size check in the asn1_encode_simple_der function. This can lead to unexpected behavior during the encoding process, potentially resulting in unauthorized access to sensitive data.
The vulnerability is categorized under CWE-193, which relates to the improper handling of array sizes. The critical nature of this vulnerability is further emphasized by its high confidentiality and availability impacts, as indicated by the CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.
This vulnerability was published on October 24, 2022, and has been assigned a critical severity level due to its potential exploitation risk across multiple platforms.
Technical Analysis
The root cause of CVE-2021-46848 lies in an off-by-one error in the ETYPE_OK array size check. This flaw allows the encoding function to process an unexpected amount of data, which can lead to buffer overflows or memory corruption. The attack vector is network-based, making it accessible over the internet.
The attack complexity is classified as low, meaning that an attacker does not need advanced skills to exploit this vulnerability. Additionally, no privileges are required to initiate an attack, and user interaction is not necessary.
The confidentiality impact is high, as successful exploitation may lead to unauthorized access to sensitive information. The integrity impact is negligible, and the availability impact is also high, as the vulnerability may result in service disruptions.
Risk & Impact Analysis
The deployment risk associated with CVE-2021-46848 is significant, especially for organizations using affected versions of GNU Libtasn1 in their applications or systems. The blast radius of this vulnerability is extensive, given the potential for network-based exploitation.
Given the critical severity of this vulnerability, organizations are advised to assess their exposure and prioritize remediation efforts based on their risk profile. The urgency for patching is underscored by the potential for exploitation and the high impact on confidentiality and availability.
The lack of public exploits does not diminish the risk; proactive measures should be taken to mitigate potential threats. Organizations should stay informed of any updates regarding this vulnerability and its implications.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of GNU Libtasn1 prior to 4.19.0 are affected by this vulnerability. Additionally, specific versions of Fedora (35, 36, 37) and Debian (10.0) distributions are also vulnerable.
Mitigation & Remediation
Organizations should update to GNU Libtasn1 version 4.19.0 or later to mitigate the risks associated with this vulnerability. If upgrading is not immediately possible, consider implementing network controls to limit exposure and monitor for unusual activity.
Configuration hardening is also recommended, including restricting access to vulnerable components and employing logging mechanisms to detect potential exploitation attempts.
Organizations should validate remediation effectiveness through penetration testing to identify similar weaknesses.
Detection Guidance
Security teams should monitor logs for indicators of exploitation attempts, such as unusual access patterns or error messages related to asn1_encode_simple_der. Additionally, behavioral anomalies in applications utilizing GNU Libtasn1 should be closely observed.
Network signatures should be established to detect any suspicious traffic patterns that may indicate an attempt to exploit this vulnerability.
AppSecure Threat Intelligence Insight
The significance of CVE-2021-46848 highlights the ongoing challenges in maintaining secure coding practices, especially in widely used libraries. This incident underscores the importance of regular updates and vulnerability management within organizations.
Security teams should take this opportunity to review their development and deployment processes, ensuring that vulnerabilities are addressed proactively. Implementing a robust vulnerability management program can help identify and prioritize remediation efforts.
Furthermore, the incident is a reminder of the need for continuous security testing. Engaging in penetration testing methodology can uncover similar vulnerabilities before they become critical issues.
Lastly, staying informed about vulnerabilities like CVE-2021-46848 can help organizations better understand the evolving threat landscape and develop strategies to mitigate potential risks.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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