CVE-2020-8616
Publication date 19 May 2020
Last updated 24 July 2024
Ubuntu priority
A malicious actor who intentionally exploits this lack of effective limitation on the number of fetches performed when processing referrals can, through the use of specially crafted referrals, cause a recursing server to issue a very large number of fetches in an attempt to process the referral. This has at least two potential effects: The performance of the recursing server can potentially be degraded by the additional work required to perform these fetches, and The attacker can exploit this behavior to use the recursing server as a reflector in a reflection attack with a high amplification factor.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| bind9 | 20.04 LTS focal |
Fixed 1:9.16.1-0ubuntu2.1
|
| 18.04 LTS bionic |
Fixed 1:9.11.3+dfsg-1ubuntu1.12
|
|
| 16.04 LTS xenial |
Fixed 1:9.10.3.dfsg.P4-8ubuntu1.16
|
|
| 14.04 LTS trusty |
Fixed 1:9.9.5.dfsg-3ubuntu0.19+esm2
|
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Get Ubuntu ProSeverity score breakdown
| Parameter | Value |
|---|---|
| Base score |
8.6 · High
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Changed |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-4365-1
- Bind vulnerabilities
- 19 May 2020
- USN-4365-2
- Bind vulnerabilities
- 20 May 2020