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CVE-2021-25216— ISC BIND 缓冲区错误漏洞

一分钟漏洞结论

影响对象
ISC BIND9
利用判断
利用概率较高，应尽快评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

ISC BIND是美国ISC公司的一套实现了DNS协议的开源软件。 BIND 存在缓冲区错误漏洞，该漏洞源于BIND的GSSAPI安全策略。

CVSS 8.1 · High EPSS 82.37% · P100
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一、 漏洞 CVE-2021-25216 基础信息

漏洞信息
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Vulnerability Title
A second vulnerability in BIND's GSSAPI security policy negotiation can be targeted by a buffer overflow attack
来源: CVE Program / CVE List V5
Vulnerability Description
In BIND 9.5.0 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BIND 9.11.3-S1 -> 9.11.29-S1 and 9.16.8-S1 -> 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.1 of the BIND 9.17 development branch, 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 values for the tkey-gssapi-keytab or tkey-gssapi-credential configuration 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. For servers that meet these conditions, the ISC SPNEGO implementation is vulnerable to various attacks, depending on the CPU architecture for which BIND was built: For named binaries compiled for 64-bit platforms, this flaw can be used to trigger a buffer over-read, leading to a server crash. For named binaries compiled for 32-bit platforms, this flaw can be used to trigger a server crash due to a buffer overflow and possibly also to achieve remote code execution. We have determined that standard SPNEGO implementations are available in the MIT and Heimdal Kerberos libraries, which support a broad range of operating systems, rendering the ISC implementation unnecessary and obsolete. Therefore, to reduce the attack surface for BIND users, we will be removing the ISC SPNEGO implementation in the April releases of BIND 9.11 and 9.16 (it had already been dropped from BIND 9.17). We would not normally remove something from a stable ESV (Extended Support Version) of BIND, but since system libraries can replace the ISC SPNEGO implementation, we have made an exception in this case for reasons of stability and security.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
ISC BIND 缓冲区错误漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
ISC BIND是美国ISC公司的一套实现了DNS协议的开源软件。 BIND 存在缓冲区错误漏洞，该漏洞源于BIND的GSSAPI安全策略。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD

受影响产品

厂商 产品 影响版本 CPE 订阅
ISC BIND9 Open Source Branches 9.5 though 9.11 9.5.0 through versions before 9.11.31 -

二、漏洞 CVE-2021-25216 的公开POC

# POC 描述 源链接 神龙链接
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三、漏洞 CVE-2021-25216 的情报信息

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CVE-2021-25216 厂商安全公告 (4)

CVE-2021-25216 邮件列表归档 (4)

CVE-2021-25216 其他参考 (1)

同批安全公告 · ISC · 2021-04-29 · 共 3 条

CVE-2021-25215 7.5 HIGH ISC BIND 安全漏洞
CVE-2021-25214 6.5 MEDIUM ISC BIND 安全漏洞

IV. Related Vulnerabilities

Same product: BIND9
Same vendor: ISC

V. Comments for CVE-2021-25216

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