CVE-2023-29013 in Traefik
Summary
by MITRE • 04/14/2023
Traefik (pronounced traffic) is a modern HTTP reverse proxy and load balancer for deploying microservices. There is a vulnerability in Go when parsing the HTTP headers, which impacts Traefik. HTTP header parsing could allocate substantially more memory than required to hold the parsed headers. This behavior could be exploited to cause a denial of service. This issue has been patched in versions 2.9.10 and 2.10.0-rc2.
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Analysis
by VulDB Data Team • 02/14/2025
The vulnerability identified as CVE-2023-29013 affects Traefik, a popular HTTP reverse proxy and load balancer designed for modern microservices architectures. This security flaw stems from a memory allocation issue within Go's HTTP header parsing mechanism that directly impacts Traefik's processing capabilities. The vulnerability manifests when Traefik encounters HTTP headers that trigger excessive memory allocation during the parsing process, creating a significant operational risk for systems relying on this proxy solution.
The technical flaw resides in how Go handles HTTP header parsing, specifically when processing certain header values that cause the parser to allocate memory proportional to the header content rather than the actual required space. This memory allocation behavior becomes problematic when malicious or malformed headers are processed, leading to substantial memory consumption that can overwhelm system resources. The vulnerability represents a classic example of a resource exhaustion attack vector where an attacker can craft HTTP requests designed to trigger excessive memory allocation within the Traefik process.
From an operational impact perspective, this vulnerability creates a significant denial of service risk for systems using affected Traefik versions. When exploited, the excessive memory allocation can cause the Traefik process to consume all available memory resources, leading to process crashes, system instability, and complete service disruption. Organizations relying on Traefik for their microservices infrastructure face potential downtime and performance degradation that could affect multiple applications and services dependent on the proxy. The vulnerability is particularly concerning in high-traffic environments where the memory exhaustion can occur rapidly and with minimal payload size.
The mitigation strategy involves upgrading to patched versions of Traefik, specifically versions 2.9.10 and 2.10.0-rc2, which contain the necessary fixes to address the memory allocation issue. Organizations should prioritize this upgrade across their infrastructure, particularly in production environments where the vulnerability could be exploited. Additionally, implementing proper input validation and header sanitization measures can provide additional defense-in-depth protection. Security teams should monitor their Traefik deployments for any signs of memory exhaustion patterns and establish alerting mechanisms to detect potential exploitation attempts. This vulnerability aligns with CWE-1321 which addresses improper handling of memory allocation in parsing operations, and represents a potential vector for attacks categorized under the denial of service tactics in the MITRE ATT&CK framework.