Описание
The attack vector is a potential Denial of Service (DoS). The vulnerability is caused by an insufficient check on the length of a decompressed domain name within a DNS packet.
An attacker can craft a malicious DNS packet containing a highly compressed domain name. When the resolv library parses such a packet, the name decompression process consumes a large amount of CPU resources, as the library does not limit the resulting length of the name.
This resource consumption can cause the application thread to become unresponsive, resulting in a Denial of Service condition.
A denial of service flaw was found in resolv ruby gem. This flaw allows an attacker to craft a malicious DNS packet containing a highly compressed domain name. When the resolv library parses this packet, the name decompression process consumes a large amount of CPU resources, as the library does not limit the resulting length of the name.
Отчет
Moderate impact affects Red Hat Insights compliance-backend and Red Hat Enterprise Linux Ruby packages in the affected RHEL streams. A remote attacker without privileges can send a crafted DNS packet containing a highly compressed domain name to a process using the resolv gem; excessive decompression CPU consumption can make the application thread unresponsive, resulting in denial of service. Red Hat's CVSS is 5.3 (Moderate), lower than CISA's 7.5 (Important) because Red Hat assesses the availability impact as Low rather than High. Remediation for the affected entries is deferred in the current record, which does not document a more specific reason; the residual risk is continued CPU exhaustion and denial of service when attacker-supplied DNS packets are parsed. Ruby 4.0 entries in RHEL 9 and RHEL 10 are not affected because the vulnerable code is not present, while the RHEL 6 and RHEL 7 entries are marked out of support.
Меры по смягчению последствий
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 10 | ruby4.0 | Not affected | ||
| Red Hat Enterprise Linux 6 | ruby | Out of support scope | ||
| Red Hat Enterprise Linux 7 | ruby | Out of support scope | ||
| Red Hat Enterprise Linux 8 | ruby:2.5/ruby | Fix deferred | ||
| Red Hat Enterprise Linux 9 | ruby | Fix deferred | ||
| Red Hat Enterprise Linux 9 | ruby:4.0/ruby | Not affected | ||
| Red Hat Enterprise Linux 10 | ruby | Fixed | RHSA-2025:23141 | 11.12.2025 |
| Red Hat Enterprise Linux 10.0 Extended Update Support | ruby | Fixed | RHSA-2025:23927 | 22.12.2025 |
| Red Hat Enterprise Linux 8 | ruby | Fixed | RHSA-2025:23062 | 10.12.2025 |
| Red Hat Enterprise Linux 9 | ruby | Fixed | RHSA-2025:23063 | 10.12.2025 |
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Дополнительная информация
Статус:
EPSS
5.3 Medium
CVSS3
Связанные уязвимости
The attack vector is a potential Denial of Service (DoS). The vulnerability is caused by an insufficient check on the length of a decompressed domain name within a DNS packet. An attacker can craft a malicious DNS packet containing a highly compressed domain name. When the resolv library parses such a packet, the name decompression process consumes a large amount of CPU resources, as the library does not limit the resulting length of the name. This resource consumption can cause the application thread to become unresponsive, resulting in a Denial of Service condition.
The attack vector is a potential Denial of Service (DoS). The vulnerability is caused by an insufficient check on the length of a decompressed domain name within a DNS packet. An attacker can craft a malicious DNS packet containing a highly compressed domain name. When the resolv library parses such a packet, the name decompression process consumes a large amount of CPU resources, as the library does not limit the resulting length of the name. This resource consumption can cause the application thread to become unresponsive, resulting in a Denial of Service condition.
The attack vector is a potential Denial of Service (DoS). The vulnerability is caused by an insufficient check on the length of a decompressed domain name within a DNS packet. An attacker can craft a malicious DNS packet containing a highly compressed domain name. When the resolv library parses such a packet, the name decompression process consumes a large amount of CPU resources, as the library does not limit the resulting length of the name. This resource consumption can cause the application thread to become unresponsive, resulting in a Denial of Service condition.
The attack vector is a potential Denial of Service (DoS). The vulnerab ...
EPSS
5.3 Medium
CVSS3