Risk | Medium |
Patch available | YES |
Number of vulnerabilities | 1 |
CVE-ID | CVE-2024-33655 |
CWE-ID | CWE-399 |
Exploitation vector | Network |
Public exploit | N/A |
Vulnerable software |
Anolis OS Operating systems & Components / Operating system unbound-utils Operating systems & Components / Operating system package or component unbound-libs Operating systems & Components / Operating system package or component unbound-devel Operating systems & Components / Operating system package or component unbound-anchor Operating systems & Components / Operating system package or component unbound Operating systems & Components / Operating system package or component python3-unbound Operating systems & Components / Operating system package or component |
Vendor | OpenAnolis |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
EUVDB-ID: #VU89361
Risk: Medium
CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2024-33655
CWE-ID:
CWE-399 - Resource Management Errors
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to way Unbound queues DNS requests, which makes it susceptible to DNSBomb attack. A remote attacker with ability to control the delay of the malicious authoritative answers can force Unbound to slowly accumulate pending answers for the spoofed addresses. When the authoritative answers become available to Unbound at the same time, Unbound starts serving all the accumulated queries. This results in large-sized, concentrated response bursts to the spoofed addresses.
Unbound itself is not vulnerable for DoS, rather it can be used to take part in a pulsing DoS amplification attack.
Install updates from vendor's repository.
Vulnerable software versionsAnolis OS: 23
unbound-utils: before 1.17.1-3
unbound-libs: before 1.17.1-3
unbound-devel: before 1.17.1-3
unbound-anchor: before 1.17.1-3
unbound: before 1.17.1-3
python3-unbound: before 1.17.1-3
CPE2.3https://anas.openanolis.cn/errata/detail/ANSA-2025:0060
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.