Buffer overflow in Isc Bind
CVE-2020-8625
BIND servers are vulnerable if they are running an affected version and are configured to use GSS-TSIG features. In a configuration which uses BIND's default settings the vulnerable code path is not exposed, but a server can be rendered vulnerable by explicitly setting valid values for the tkey-gssapi-keytab or tkey-gssapi-credentialconfiguration options. Although the default configuration is not vulnerable, GSS-TSIG is frequently used in networks where BIND is integrated with Samba, as well as in mixed-server environments that combine BIND servers with Active Directory domain controllers. The most likely outcome of a successful exploitation of the vulnerability is a crash of the named process. However, remote code execution, while unproven, is theoretically possible. Affects: BIND 9.5.0 -> 9.11.27, 9.12.0 -> 9.16.11, and versions BIND 9.11.3-S1 -> 9.11.27-S1 and 9.16.8-S1 -> 9.16.11-S1 of BIND Supported Preview Edition. Also release versions 9.17.0 -> 9.17.1 of the BIND 9.17 development branch
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.642 (99.2th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.642 · newest: 0.642 · change: 0.000
Affected products
- Isc Bind — versions 9.11.3, 9.11.5, 9.11.6
- Isc Bind9 — versions Open Source Branches 9.5 though 9.11 9.5.0 through versions before 9.11.28, Open Source Branches 9.12 though 9.16 9.12.0 through versions before 9.16.12, Supported Preview Branch 9.11-S 9.11.3-S1 through versions before 9.11.28-S1
- NetApp 500f
- NetApp 500f Firmware
- NetApp A250
- NetApp A250 Firmware
- NetApp Cloud Backup
- Siemens Sinec Infrastructure Network Services
- Debian Linux — versions 9.0, 10.0
- Fedoraproject Fedora — versions 32, 33, 34
Weakness classification (CWE)
Public proof-of-concept exploits
References
- kb.isc.org/v1/docs/cve-2020-8625 (Mitigation, Vendor Advisory)
- www.debian.org/security/2021/dsa-4857 (vendor-advisory, Third Party Advisory)
- www.openwall.com/lists/oss-security/2021/02/19/1 (mailing-list, Patch, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/02/msg00029.html (mailing-list, Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2021/02/20/2 (mailing-list, Patch, Mailing List, Third Party Advisory)
- www.zerodayinitiative.com/advisories/ZDI-21-195/ (VDB Entry, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- security.netapp.com/advisory/ntap-20210319-0001/ (Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
Frequently asked questions
- What is CVE-2020-8625?
- CVE-2020-8625 is a high-severity vulnerability in Isc Bind, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.1/10. Published 2021-02-17.
- How severe is CVE-2020-8625?
- High severity. CVSS v3 base score is 8.1 out of 10.
- Is CVE-2020-8625 known to be exploited?
- 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.