CVE-2020-8616: falha de alta gravidade em ISC BIND9
BIND does not sufficiently limit the number of fetches performed when processing referrals
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26Vexday Risk Score
Sem sinal de exploração. Nenhum artefato público de exploração conhecido até agora.
ssvc Trackcvss 8.6epss 11%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Produtos afetados
ISC · BIND9CVEs relacionadas — ISC BIND9
No mesmo produto, das mais perigosas para as menos.
CVE-2020-8617HIGHA logic error in code which checks TSIG validity can be used to trigger an assertion failure in tsig.cEPSS 93.3%CVE-2021-25216HIGHA second vulnerability in BIND's GSSAPI security policy negotiation can be targeted by a buffer overflow attackEPSS 83.0%CVE-2020-8625HIGHA vulnerability in BIND's GSSAPI security policy negotiation can be targeted by a buffer overflow attackEPSS 64.2%CVE-2021-25215HIGHAn assertion check can fail while answering queries for DNAME records that require the DNAME to be processed to resolve itselfEPSS 11.7%CVE-2021-25219MEDIUMLame cache can be abused to severely degrade resolver performanceEPSS 11.2%CVE-2020-8623HIGHA flaw in native PKCS#11 code can lead to a remotely triggerable assertion failure in pk11.cEPSS 6.6%
Referências
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.htmlhttps://kb.isc.org/docs/cve-2020-8616https://lists.debian.org/debian-lts-announce/2020/05/msg00031.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JKJXVBOKZ36ER3EUCR7VRB7WGHIIMPNJ/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WOGCJS2XQ3SQNF4W6GLZ73LWZJ6ZZWZI/https://security.netapp.com/advisory/ntap-20200522-0002/https://usn.ubuntu.com/4365-1/https://usn.ubuntu.com/4365-2/https://www.debian.org/security/2020/dsa-4689https://www.synology.com/security/advisory/Synology_SA_20_12http://www.nxnsattack.com