CVE-2020-8625

一、漏洞信息
 漏洞编号：[CVE-2020-8625](https://nvd.nist.gov/vuln/detail/CVE-2020-8625)
 漏洞归属组件：bind
 漏洞归属的版本：9.11.21,9.11.4
 CVSS V3.0分值：
  BaseScore：8.1 High
  Vector：CVSS：3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
 漏洞简述：
  BIND servers are vulnerable if they are running an affected version and are configured to use GSS-TSIG features. In a configuration which uses BINDs 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
 漏洞公开时间：
 漏洞创建时间：2021-03-06 09:01:49
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2020-8625
 漏洞分析指导链接：
  https://gitee.com/openeuler/cve-manager/blob/master/doc/md/manual.md
二、漏洞分析结构反馈
 影响性分析说明：
  GSS-TSIG是TSIG协议的扩展，用于支持密钥的安全交换，用于验证网络上双方通信的真实性。SPNEGO是GSS-TSIG的应用协议接口GSSAPI使用的协商机制。BIND使用的SPNEGO实现容易受到缓冲区溢出攻击。如果BIND服务器运行受影响的版本并配置为使用GSS-TSIG功能，则它们会受到攻击。在使用BIND默认设置的配置中，不暴露易受攻击的代码路径，但是通过为tkey-gssapi-keytab或tkey-gssapi-credentialconfiguration选项显式设置有效值，服务器可能会变得易受攻击，造成named进程崩溃。
 openEuler评分：
  8.1
 Vector：CVSS：3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
 受影响版本排查(受影响/不受影响)：
  1.openEuler-20.03-LTS:受影响
2.openEuler-20.03-LTS-SP1:受影响
3.openEuler-20.09:受影响

三、漏洞修复
安全公告链接：https://openeuler.org/zh/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1041

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