Detections
Analytics
Alibaba Cloud Linux 3 : 0124: unbound (ALINUX3-SA-2025:0124)
high Nessus Plugin ID 243965
Synopsis
The remote Alibaba Cloud Linux host is missing one or more security updates.Description
The remote Alibaba Cloud Linux 3 host has packages installed that are affected by a vulnerability as referenced in the ALINUX3-SA-2025:0124 advisory.Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:
CVE-2025-5994:
A multi-vendor cache poisoning vulnerability named 'Rebirthday Attack' has been discovered in caching resolvers that support EDNS Client Subnet (ECS). Unbound is also vulnerable when compiled with ECS support, i.e., '--enable-subnet', AND configured to send ECS information along with queries to upstream name servers, i.e., at least one of the 'send-client-subnet', 'client-subnet-zone' or 'client-subnet- always-forward' options is used. Resolvers supporting ECS need to segregate outgoing queries to accommodate for different outgoing ECS information. This re-opens up resolvers to a birthday paradox attack (Rebirthday Attack) that tries to match the DNS transaction ID in order to cache non-ECS poisonous replies.
Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux security advisory.
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Update the affected packages.See Also
http://mirrors.aliyun.com/alinux/3/cve/alinux3-sa-20250124.xml
Plugin Details
Severity: High
ID: 243965
File Name: alinux3_sa_2025-0124.nasl
Version: 1.1
Type: local
Published: 8/6/2025
Updated: 8/6/2025
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Low
Score: 3.6
CVSS v2
Risk Factor: High
Base Score: 7.8
Temporal Score: 5.8
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:C/A:N
CVSS Score Source: CVE-2025-5994
CVSS v3
Risk Factor: High
Base Score: 7.5
Temporal Score: 6.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
CVSS v4
Risk Factor: High
Base Score: 8.7
Threat Score: 6.6
Threat Vector: CVSS:4.0/E:U
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Vulnerability Information
CPE: p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:unbound, cpe:/o:alibabacloud:alibaba_cloud_linux_3, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:unbound-libs-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:unbound-devel, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:python3-unbound-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:unbound-debuginfo, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:unbound-libs, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:python3-unbound, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:unbound-debugsource
Required KB Items: Host/local_checks_enabled, Host/Alibaba/release, Host/Alibaba/rpm-list, Host/cpu
Exploit Ease: No known exploits are available
Patch Publication Date: 7/31/2025
Vulnerability Publication Date: 7/16/2025
Reference Information
CVE: CVE-2025-5994