Vulnerability · Published Feb 17, 2021 · Assigned by isc
CVE-2020-8625A vulnerability in BIND's GSSAPI security policy negotiation can be targeted by a buffer overflow attack
High 8.1
In plain English
A high-severity security flaw in BIND9 from ISC. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 64.2% (higher than 99.2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | bind | 9.16.11-r2 | ALPINE-CVE-2020-8625 |
| Alpine:v3.21 | bind | 9.16.11-r2 | ALPINE-CVE-2020-8625 |
| Alpine:v3.22 | bind | 9.16.11-r2 | ALPINE-CVE-2020-8625 |
| Alpine:v3.23 | bind | 9.16.11-r2 | ALPINE-CVE-2020-8625 |
| Alpine:v3.24 | bind | 9.16.11-r2 | ALPINE-CVE-2020-8625 |
| Debian:12 | bind9 | 1:9.16.12-1 | DEBIAN-CVE-2020-8625 |
| Debian:13 | bind9 | 1:9.16.12-1 | DEBIAN-CVE-2020-8625 |
| Debian:14 | bind9 | 1:9.16.12-1 | DEBIAN-CVE-2020-8625 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ISC | BIND9 | Open Source Branches 9.5 though 9.11 9.5.0 through versions before 9.11.28Open Source Branches 9.12 though 9.16 9.12.0 through versions before 9.16.12Supported Preview Branch 9.11-S 9.11.3-S1 through versions before 9.11.28-S1Supported Preview Branch 9.16-S 9.16.8-S1 through versions before 9.16.12-S1Development Branch 9.17 9.17.0 through versions before 9.17.2 |
References
- https://kb.isc.org/v1/docs/cve-2020-8625 x_refsource_CONFIRM
- DSA-4857 vendor-advisory, x_refsource_DEBIAN
- [oss-security] 20210218 BIND Operational Notification: Enabling the new BIND option "stale-answer-client-timeout" can result in unexpected server termination mailing-list, x_refsource_MLIST
- [debian-lts-announce] 20210219 [SECURITY] [DLA 2568-1] bind9 security update mailing-list, x_refsource_MLIST
- [oss-security] 20210220 BIND Operational Notification: Zone journal (.jnl) file incompatibility,after upgrading to BIND 9.16.12 and 9.17 mailing-list, x_refsource_MLIST
- https://www.zerodayinitiative.com/advisories/ZDI-21-195/ x_refsource_MISC
- FEDORA-2021-0595625865 vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-28f97e232d vendor-advisory, x_refsource_FEDORA
- https://security.netapp.com/advisory/ntap-20210319-0001/ x_refsource_CONFIRM
- FEDORA-2021-8b4744f152 vendor-advisory, x_refsource_FEDORA
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf x_refsource_CONFIRM