ISC DHCP官网安全更新(2018-11-16)

来源:ISC DHCP官网 发布日期:2018-11-16 阅读次数:263 评论:0





感知时间:2019-12-05 19:42:04




CVE-2018-5732: A specially constructed response from a malicious server can cause a buffer overflow in dhclient


CVE: CVE-2018-5732
Document version: 2.0
Posting date: 28 February 2018
Program impacted: ISC DHCP
Versions affected: 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0
Severity: High
Exploitable: Remotely
Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section.
Affected versions of dhclient should crash due to an out-of-bounds memory access if they receive and process a triggering response packet. However, buffer overflow outcomes can vary by operating system, and outcomes such as remote code execution may be possible in some circumstances. Where they are present, operating system mitigation strategies such as address space layout randomization (ASLR) should make it difficult to leverage this vulnerability to achieve remote code execution, but we cannot rule it out as impossible. The safest course is to patch dhclient so that the buffer overflow cannot occur.
CVSS Score: 7.5
For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Workarounds: None.
Active exploits: No known active exploits.
Solution: Upgrade to the patched release most closely related to your current version of DHCP. These are all available at https://www.isc.org/downloads.

DHCP 4.1-ESV-R15-P1
DHCP 4.3.6-P1
DHCP 4.4.1

Acknowledgements: ISC would like to thank Felix Wilhelm, Google Security Team, for reporting this vulnerability.
Document Revision History:
1.0 Advance Notification, 21 February 2018

1.1 Strengthened language in "Impact" section, 27 February 2018

2.0 Public Disclosure, 28 February 2018
Related documents:
See our BIND 9 Security Vulnerability Matrix for a complete listing of security vulnerabilities and versions affected.
Do you still have questions? Questions regarding this advisory should go to security-officer@isc.org. To report a new issue, please encrypt your message using security-officer@isc.org's PGP key which can be found here: https://www.isc.org/downloads/software-support-policy/openpgp-key/. If you are unable to use encrypted email, you may also report new issues at: https://www.isc.org/community/report-bug/.
ISC patches only currently supported versions. When possible we indicate EOL versions affected. (For current information on which versions are actively supported, please see https://www.isc.org/downloads/.)
ISC Security Vulnerability Disclosure Policy:
Details of our current security advisory policy and practice can be found in the ISC Software Defect and Security Vulnerability Disclosure Policy.
This Knowledgebase article is the complete and official security advisory document.
Legal Disclaimer:
Internet Systems Consortium (ISC) is providing this notice on an "AS IS" basis. No warranty or guarantee of any kind is expressed in this notice and none should be implied. ISC expressly excludes and disclaims any warranties regarding this notice or materials referred to in this notice, including, without limitation, any implied warranty of merchantability, fitness for a particular purpose, absence of hidden defects, or of non-infringement. Your use or reliance on this notice or materials referred to in this notice is at your own risk. ISC may change this notice at any time. A stand-alone copy or paraphrase of the text of this document that omits the document URL is an uncontrolled copy. Uncontrolled copies may lack important information, be out of date, or contain factual errors.


ISC DHCP为实施DHCP服务器,中继代理和客户端提供了完整的开源解决方案。ISC DHCP支持IPv4和IPv6,并且适合在高容量和高可靠性应用程序中使用。







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