Plattform
nodejs
Komponente
is
Behoben in
0.9.1
CVE-2020-26302 affects the is.js general-purpose check library, specifically versions 0.9.0 and earlier. This vulnerability stems from inefficient regular expressions used for URL validation, leading to a Regular Expression Denial of Service (ReDoS). An attacker can exploit this by providing a crafted malicious string, causing the regex to loop indefinitely and potentially crashing the application. Upgrade to version 0.9.1 to resolve this issue.
The primary impact of CVE-2020-26302 is a Denial of Service (DoS). An attacker can send a specially crafted URL string to an application using the vulnerable is.js library, triggering the ReDoS condition. This can lead to the application becoming unresponsive, potentially impacting availability for legitimate users. The severity is amplified if the application is critical to business operations or handles sensitive data. While the vulnerability itself is contained within the is.js library, its impact can cascade to the entire application if the library is a core dependency. The lack of a patch for versions prior to 0.9.1 significantly increases the risk.
CVE-2020-26302 was identified using a CodeQL query, highlighting the effectiveness of static analysis tools in finding ReDoS vulnerabilities. The vulnerability is not currently listed on KEV or EPSS, suggesting a low probability of active exploitation. Public Proof-of-Concept (PoC) code may exist, but there are no reports of widespread exploitation campaigns targeting this specific vulnerability. The vulnerability was published on 2022-12-23, indicating a relatively recent disclosure.
Applications built using is.js, particularly those that handle user-supplied URLs without proper validation, are at risk. Node.js projects relying on this library are especially vulnerable. Shared hosting environments where multiple applications share the same server resources could experience broader impact from a successful attack.
• nodejs: Monitor CPU usage spikes when validating URLs. Use ps or top to identify processes consuming excessive CPU.
ps aux | grep is.js• generic web: Examine access logs for unusual patterns of URL requests. Look for URLs containing complex or unusual characters.
grep 'complex_url_pattern' /var/log/apache2/access.logdiscovery
disclosure
Exploit-Status
EPSS
0.27% (51% Perzentil)
CVSS-Vektor
The recommended mitigation for CVE-2020-26302 is to upgrade to version 0.9.1 or later of the is.js library. If upgrading is not immediately feasible due to compatibility issues or breaking changes, consider implementing input validation on the URL strings before passing them to the is.js library. This can involve whitelisting allowed characters or limiting the length of the URL. Web Application Firewalls (WAFs) might be configured to detect and block requests containing potentially malicious URL patterns, although this is not a guaranteed solution. Due to the nature of ReDoS, detection is challenging and often requires behavioral analysis. After upgrading, confirm the fix by attempting to validate a known malicious URL string and verifying that it no longer triggers a denial of service.
Este paquete contiene una vulnerabilidad ReDoS. No existe una versión corregida. Se recomienda evaluar alternativas a la librería is.js o implementar validaciones adicionales para las URLs antes de usar la función vulnerable.
Schwachstellenanalysen und kritische Warnungen direkt in deinen Posteingang.
CVE-2020-26302 is a Denial of Service vulnerability in is.js versions 0.9.0 and earlier, where malicious URLs can trigger a ReDoS attack, causing excessive CPU usage.
You are affected if you are using is.js version 0.9.0 or earlier. Upgrade to 0.9.1 or later to mitigate the risk.
Upgrade to version 0.9.1 or later. If upgrading is not possible, implement input sanitization to validate URLs before processing.
No active exploitation campaigns have been publicly reported, but ReDoS vulnerabilities are often targeted by automated scanners.
Refer to the CVE entry on the NVD website: https://nvd.nist.gov/vuln/detail/CVE-2020-26302
Lade deine Abhängigkeitsdatei hoch und erfahre sofort, ob dich diese und andere CVEs treffen.