A vulnerability was identified in the kjd/idna library, specifically within the idna.encode() function, affecting version 3.6. The issue arises from the functions handling of crafted input strings, which can lead to quadratic complexity and consequently, a denial of service condition. This vulnerability is triggered by a crafted input that causes the idna.encode() function to process the input with considerable computational load, significantly increasing the processing time in a quadratic manner relative to the input size.
The product does not properly control the allocation and maintenance of a limited resource.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Internationalized_domain_names_in_applications | Kjd | 0.2 (including) | 3.7 (excluding) |
| Red Hat Ansible Automation Platform 2.4 for RHEL 8 | RedHat | python3x-idna-0:3.7-1.el8ap | * |
| Red Hat Ansible Automation Platform 2.4 for RHEL 9 | RedHat | python-idna-0:3.7-1.el9ap | * |
| Red Hat Enterprise Linux 7 Extended Lifecycle Support | RedHat | python-idna-0:2.4-2.el7_9 | * |
| Red Hat Enterprise Linux 8 | RedHat | python39:3.9-8100020240516111311.d47b87a4 | * |
| Red Hat Enterprise Linux 8 | RedHat | python39-devel:3.9-8100020240516111311.d47b87a4 | * |
| Red Hat Enterprise Linux 8 | RedHat | python-idna-0:2.5-7.el8_10 | * |
| Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | RedHat | python-idna-0:2.5-5.el8_6.1 | * |
| Red Hat Enterprise Linux 8.6 Telecommunications Update Service | RedHat | python-idna-0:2.5-5.el8_6.1 | * |
| Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions | RedHat | python-idna-0:2.5-5.el8_6.1 | * |
| Red Hat Enterprise Linux 8.8 Extended Update Support | RedHat | python-idna-0:2.5-5.el8_8.1 | * |
| Red Hat Enterprise Linux 9 | RedHat | python-idna-0:2.10-7.el9_4.1 | * |
| Python-idna | Ubuntu | esm-infra/bionic | * |
| Python-idna | Ubuntu | esm-infra/focal | * |
| Python-idna | Ubuntu | esm-infra/xenial | * |
| Python-idna | Ubuntu | focal | * |
| Python-idna | Ubuntu | jammy | * |
| Python-idna | Ubuntu | mantic | * |
| Python-idna | Ubuntu | noble | * |
| Python-pip | Ubuntu | esm-apps/bionic | * |
| Python-pip | Ubuntu | esm-apps/focal | * |
| Python-pip | Ubuntu | esm-apps/jammy | * |
| Python-pip | Ubuntu | esm-apps/noble | * |
| Python-pip | Ubuntu | esm-apps/xenial | * |
| Python-pip | Ubuntu | focal | * |
| Python-pip | Ubuntu | jammy | * |
| Python-pip | Ubuntu | mantic | * |
| Python-pip | Ubuntu | noble | * |
| Python-pip | Ubuntu | oracular | * |
| Python-pip | Ubuntu | trusty/esm | * |
Mitigation of resource exhaustion attacks requires that the target system either:
The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.
The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.