Compute
Elastic Cloud Server
Huawei Cloud Flexus
Bare Metal Server
Auto Scaling
Image Management Service
Dedicated Host
FunctionGraph
Cloud Phone Host
Huawei Cloud EulerOS
Networking
Virtual Private Cloud
Elastic IP
Elastic Load Balance
NAT Gateway
Direct Connect
Virtual Private Network
VPC Endpoint
Cloud Connect
Enterprise Router
Enterprise Switch
Global Accelerator
Management & Governance
Cloud Eye
Identity and Access Management
Cloud Trace Service
Resource Formation Service
Tag Management Service
Log Tank Service
Config
OneAccess
Resource Access Manager
Simple Message Notification
Application Performance Management
Application Operations Management
Organizations
Optimization Advisor
IAM Identity Center
Cloud Operations Center
Resource Governance Center
Migration
Server Migration Service
Object Storage Migration Service
Cloud Data Migration
Migration Center
Cloud Ecosystem
KooGallery
Partner Center
User Support
My Account
Billing Center
Cost Center
Resource Center
Enterprise Management
Service Tickets
HUAWEI CLOUD (International) FAQs
ICP Filing
Support Plans
My Credentials
Customer Operation Capabilities
Partner Support Plans
Professional Services
Analytics
MapReduce Service
Data Lake Insight
CloudTable Service
Cloud Search Service
Data Lake Visualization
Data Ingestion Service
GaussDB(DWS)
DataArts Studio
Data Lake Factory
DataArts Lake Formation
IoT
IoT Device Access
Others
Product Pricing Details
System Permissions
Console Quick Start
Common FAQs
Instructions for Associating with a HUAWEI CLOUD Partner
Message Center
Security & Compliance
Security Technologies and Applications
Web Application Firewall
Host Security Service
Cloud Firewall
SecMaster
Anti-DDoS Service
Data Encryption Workshop
Database Security Service
Cloud Bastion Host
Data Security Center
Cloud Certificate Manager
Edge Security
Situation Awareness
Managed Threat Detection
Blockchain
Blockchain Service
Web3 Node Engine Service
Media Services
Media Processing Center
Video On Demand
Live
SparkRTC
MetaStudio
Storage
Object Storage Service
Elastic Volume Service
Cloud Backup and Recovery
Storage Disaster Recovery Service
Scalable File Service Turbo
Scalable File Service
Volume Backup Service
Cloud Server Backup Service
Data Express Service
Dedicated Distributed Storage Service
Containers
Cloud Container Engine
SoftWare Repository for Container
Application Service Mesh
Ubiquitous Cloud Native Service
Cloud Container Instance
Databases
Relational Database Service
Document Database Service
Data Admin Service
Data Replication Service
GeminiDB
GaussDB
Distributed Database Middleware
Database and Application Migration UGO
TaurusDB
Middleware
Distributed Cache Service
API Gateway
Distributed Message Service for Kafka
Distributed Message Service for RabbitMQ
Distributed Message Service for RocketMQ
Cloud Service Engine
Multi-Site High Availability Service
EventGrid
Dedicated Cloud
Dedicated Computing Cluster
Business Applications
Workspace
ROMA Connect
Message & SMS
Domain Name Service
Edge Data Center Management
Meeting
AI
Face Recognition Service
Graph Engine Service
Content Moderation
Image Recognition
Optical Character Recognition
ModelArts
ImageSearch
Conversational Bot Service
Speech Interaction Service
Huawei HiLens
Video Intelligent Analysis Service
Developer Tools
SDK Developer Guide
API Request Signing Guide
Terraform
Koo Command Line Interface
Content Delivery & Edge Computing
Content Delivery Network
Intelligent EdgeFabric
CloudPond
Intelligent EdgeCloud
Solutions
SAP Cloud
High Performance Computing
Developer Services
ServiceStage
CodeArts
CodeArts PerfTest
CodeArts Req
CodeArts Pipeline
CodeArts Build
CodeArts Deploy
CodeArts Artifact
CodeArts TestPlan
CodeArts Check
CodeArts Repo
Cloud Application Engine
MacroVerse aPaaS
KooMessage
KooPhone
KooDrive
Help Center/ Cloud Container Engine/ Product Bulletin/ Vulnerability Notices/ Notice of the Impact of runC Vulnerability (CVE-2024-21626)

Notice of the Impact of runC Vulnerability (CVE-2024-21626)

Updated on 2025-02-22 GMT+08:00

Description

runC is a lightweight tool for running containers. It implements the Open Container Initiative (OCI) specification. runC is the core and basic component of container software such as Docker, containerd, and Kubernetes. Recently, the runC community released the latest version to fix a high-risk container escape vulnerability (CVE-2024-21626). Due to an internal file descriptor leak, an attacker could control and set the working directory or the command path of a container process to the path under the parent directory of the file descriptor. This allows the container to read and write any files from and into the node, resulting in a container escape.

For details, see RunC Container Escape Vulnerability (CVE-2024-21626).

Vulnerability Exploitation Conditions

CCE clusters in normal usage are not affected by this vulnerability.

An attacker can exploit this vulnerability only when either of the following conditions is met:

  1. The attacker can create or update workloads in a cluster.
  2. The image source of a container that runs a workload is untrusted, which enables an attacker to modify the source image.

The following shows the common ways in which exploitation can occur:

  • An attacker, with permissions to create or update workloads in a cluster, sets WORKDIR of a container process to /proc/self/fd/<num> during workload creation to access the node file system after the container runs.
  • An attacker modifies an untrusted source container image of a workload and sets the image's WORKDIR to /proc/self/fd/<num> to access the node file system after the container built from this image runs.

Impact

If either of the preceding exploitation conditions is met, a container process may escape to the node, resulting in node information leakage or malicious command execution.

Identification Method

The risks may be present if workload configurations or container images in clusters v1.21.1-r0 to v1.21.12-r2, v1.23.1-r0 to v1.23.11-r2, v1.25.1-r0 to v1.25.6-r2, v1.27.1-r0 to v1.27.3-r10, and v1.28.1-r0 to v1.28.1-r10 have either of the following characteristics:

  • WORKDIR of a container process in a workload is set to /proc/self/fd/<num>.
    Figure 1 Configurations of a workload with security risks
  • The default WORKDIR or startup command of a container image in a workload contains /proc/self/fd/<num>.
    Run the following command to view the container image metadata:
    • For a Docker container: docker inspect <Image ID>
    • For a containerd container: crictl inspecti <Image ID>
    Figure 2 Configurations of an image with security risks

Solution

Workarounds:

  • Set the WORKDIR directory of a workload to a fixed one.
  • If the WORKDIR directory is not configured for a workload, ensure that the container images used by the workload are trusted.
NOTE:

Before performing the preceding workarounds, evaluate the impact on services and perform thorough tests.

Rectification method:

We have fixed this vulnerability. Pay attention to update in Patch Versions and upgrade your clusters to the fixed version. For clusters that have reached EOS, upgrade them to versions under maintenance.

In clusters v1.21.12-r4, v1.23.11-r4, v1.25.6-r4, v1.27.3-r4, v1.28.1-r4, and later, this vulnerability was fixed.
NOTE:

Newly started containers running in clusters which were upgraded to the versions where the vulnerability was fixed are not affected. Existing containers running in clusters of the fixed versions need to be further checked. For details, see Identification Method.

  • In a running container, if WORKDIR in the container process is set to /proc/self/fd/<num>, this vulnerability still exists. To minimize risks, delete the configuration and redeploy the container.
  • In a running container, if WORKDIR in the used image is set to /proc/self/fd/<num>, this vulnerability still exists. To minimize risks, use a trusted image and redeploy the container.
  • In a running container, if WORKDIR in the container process is not set to /proc/self/fd/<num>, there is no risk.

We use cookies to improve our site and your experience. By continuing to browse our site you accept our cookie policy. Find out more

Feedback

Feedback

Feedback

0/500

Selected Content

Submit selected content with the feedback