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

Quick assessment

Affected
ISC ISC DHCP
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ISC DHCP是美国ISC公司的一套开源的动态主机配置协议服务器软件。 ISC DHCP中存在缓冲区错误漏洞，该漏洞源于程序没有正确的对用户提交的输入执行边界检测，导致复制的数据超过了缓冲区的空间。远程攻击者可利用该漏洞造成拒绝服务。以下版本受到影响：DHCP 4.1.0版本至4.1-ESV-R15版本，4.2.0版本至4.2.8版本，4.3.0版本至4.3.6版本，4.4.0版本。

AI Predicted 7.8 Difficulty: Easy EPSS 5.24% · P92

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2018-5732

Vulnerability Information
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Vulnerability Title
A specially constructed response from a malicious server can cause a buffer overflow in dhclient
Source: CVE Program / CVE List V5
Vulnerability Description
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. Affects ISC DHCP versions 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
ISC DHCP 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ISC DHCP是美国ISC公司的一套开源的动态主机配置协议服务器软件。 ISC DHCP中存在缓冲区错误漏洞，该漏洞源于程序没有正确的对用户提交的输入执行边界检测，导致复制的数据超过了缓冲区的空间。远程攻击者可利用该漏洞造成拒绝服务。以下版本受到影响：DHCP 4.1.0版本至4.1-ESV-R15版本，4.2.0版本至4.2.8版本，4.3.0版本至4.3.6版本，4.4.0版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ISC ISC DHCP ISC DHCP 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0 -

II. Public POCs for CVE-2018-5732

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III. Intelligence Information for CVE-2018-5732

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Other References for CVE-2018-5732 (1)

Same Patch Batch · ISC · 2019-10-09 · 9 CVEs total

CVE-2019-6469 BIND Supported Preview Edition can exit with an assertion failure if ECS is in use
CVE-2019-6471 A race condition when discarding malformed packets can cause BIND to exit with an assertio
CVE-2018-5743 Limiting simultaneous TCP clients was ineffective
CVE-2018-5744 A specially crafted packet can cause named to leak memory
CVE-2018-5745 An assertion failure can occur if a trust anchor rolls over to an unsupported key algorith
CVE-2019-6465 Zone transfer controls for writable DLZ zones were not effective
CVE-2019-6467 An error in the nxdomain redirect feature can cause BIND to exit with an INSIST assertion
CVE-2019-6468 BIND Supported Preview Edition can exit with an assertion failure if nxdomain-redirect is

IV. Related Vulnerabilities

Same product: ISC DHCP
Same vendor: ISC

V. Comments for CVE-2018-5732

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