CVE-2021-23370: Swiperjs Swiper Security Vulnerability

CVE-2021-23370 Overview

CVE-2021-23370 is a critical vulnerability affecting the Swiper package, a popular JavaScript library used for creating touch-enabled sliders and carousels in web applications. This vulnerability affects all versions of Swiper prior to version 6.5.1 and can be exploited remotely without authentication.

The Swiper library is widely used in Node.js applications and web projects, distributed through npm and various WebJars packages for Java-based projects. Given its popularity in front-end development for mobile-responsive interfaces, the potential attack surface for this vulnerability is substantial.

Critical Impact

This vulnerability allows unauthenticated remote attackers to potentially compromise the confidentiality, integrity, and availability of affected systems through network-based attacks requiring no user interaction.

Affected Products

• swiperjs swiper (versions before 6.5.1)
• org.webjars:swiper (Java WebJars distribution)
• org.webjars.bower:swiper (Bower WebJars distribution)
• org.webjars.npm:swiper (npm WebJars distribution)

Discovery Timeline

• April 12, 2021 - CVE-2021-23370 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2021-23370

Vulnerability Analysis

This vulnerability in the Swiper package allows remote attackers to compromise affected applications through a network-based attack vector. The vulnerability requires no privileges and no user interaction to exploit, making it particularly dangerous for publicly accessible web applications using vulnerable Swiper versions.

The flaw exists in Swiper versions prior to 6.5.1 and affects both the core JavaScript npm package and various WebJars distributions used in Java-based web applications. Applications using Swiper for implementing touch sliders, carousels, or similar UI components are at risk.

Root Cause

The specific root cause has been addressed in the security commit released by the Swiper development team. The fix was incorporated into version 6.5.1, which resolves the underlying security issue that enabled remote exploitation.

While detailed CWE classification is not available (NVD-CWE-noinfo), the vulnerability's network attack vector and lack of required authentication suggest improper input handling or validation within the library's processing logic.

Attack Vector

The vulnerability is exploitable over the network without requiring authentication or user interaction. An attacker can target web applications using vulnerable Swiper versions by sending specially crafted requests or data that the library processes unsafely.

The attack does not require any special privileges, making it accessible to unauthenticated remote attackers. Successful exploitation could lead to complete compromise of data confidentiality, integrity, and system availability.

Detection Methods for CVE-2021-23370

Indicators of Compromise

• Unexpected behavior in Swiper-based UI components on web pages
• Anomalous network traffic patterns targeting endpoints that utilize Swiper functionality
• Evidence of unauthorized data access or modification in application logs
• Unusual server resource consumption associated with slider/carousel components

Detection Strategies

• Audit package dependencies using npm audit or yarn audit to identify vulnerable Swiper versions
• Implement Software Composition Analysis (SCA) tools to continuously monitor for vulnerable dependencies
• Review application manifests and package.json files for Swiper versions prior to 6.5.1
• For Java projects, check Maven/Gradle dependencies for vulnerable WebJars packages

Monitoring Recommendations

• Enable detailed logging for web application components utilizing Swiper
• Monitor for unusual patterns in requests targeting pages with slider/carousel functionality
• Implement Web Application Firewall (WAF) rules to detect potential exploitation attempts
• Set up alerts for dependency vulnerability notifications from security scanning tools

How to Mitigate CVE-2021-23370

Immediate Actions Required

• Upgrade Swiper to version 6.5.1 or later immediately
• Audit all applications and projects for Swiper dependency usage
• Update WebJars packages in Java projects to patched versions
• Review and test application functionality after upgrading

Patch Information

The Swiper development team has released a security fix that addresses this vulnerability. Users should upgrade to Swiper version 6.5.1 or later to remediate this issue.

For npm-based projects, update using the package manager. For Java projects using WebJars, update the corresponding WebJars dependency to a version that includes Swiper 6.5.1 or later. Detailed vulnerability information is available through Snyk's JavaScript advisory.

Workarounds

• Temporarily disable or remove Swiper functionality from production applications until patching is possible
• Implement additional input validation at the application layer for data processed by Swiper
• Consider using alternative slider libraries temporarily if immediate upgrade is not feasible
• Restrict network access to affected applications where possible

# Update Swiper to patched version
npm update swiper@^6.5.1

# Or install latest version directly
npm install swiper@latest

# Verify installed version
npm list swiper