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CVE-2018-5733— A malicious client can overflow a reference counter in ISC dhcpd

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Internet Systems Consortium（ISC）公司的一套开源的动态主机配置协议服务器软件。 ISC DHCP中存在安全漏洞。远程攻击者可通过发送大量的流量利用该漏洞造成拒绝服务（内存耗尽或服务器崩溃）。以下版本受到影响：ISC 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 5.3 Difficulty: Easy EPSS 20.24% · P97

Possible ATT&CK Techniques 1 AI

T1499.001 · OS Exhaustion Flood
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I. Basic Information for CVE-2018-5733

Vulnerability Information
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Vulnerability Title
A malicious client can overflow a reference counter in ISC dhcpd
Source: CVE Program / CVE List V5
Vulnerability Description
A malicious client which is allowed to send very large amounts of traffic (billions of packets) to a DHCP server can eventually overflow a 32-bit reference counter, potentially causing dhcpd to crash. Affects ISC DHCP 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 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ISC DHCP是美国Internet Systems Consortium（ISC）公司的一套开源的动态主机配置协议服务器软件。 ISC DHCP中存在安全漏洞。远程攻击者可通过发送大量的流量利用该漏洞造成拒绝服务（内存耗尽或服务器崩溃）。以下版本受到影响：ISC 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-2018-5733

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III. Intelligence Information for CVE-2018-5733

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Vendor Advisories for CVE-2018-5733 (6)

Mailing List Discussions for CVE-2018-5733 (1)

Other References for CVE-2018-5733 (1)

Same Patch Batch · ISC · 2019-01-16 · 18 CVEs total

CVE-2017-3143 An error in TSIG authentication can permit unauthorized dynamic updates
CVE-2018-5741 Update policies krb5-subdomain and ms-subdomain do not enforce controls promised in their
CVE-2018-5740 A flaw in the "deny-answer-aliases" feature can cause an assertion failure in named
CVE-2018-5739 Failure to release memory may exhaust system resources
CVE-2018-5738 Some versions of BIND can improperly permit recursive query service to unauthorized client
CVE-2018-5737 BIND 9.12's serve-stale implementation can cause an assertion failure in rbtdb.c or other
CVE-2018-5734 A malformed request can trigger an assertion failure in badcache.c
CVE-2017-3145 Improper fetch cleanup sequencing in the resolver can cause named to crash
CVE-2017-3144 Failure to properly clean up closed OMAPI connections can exhaust available sockets
CVE-2016-9778 An error handling certain queries using the nxdomain-redirect feature could cause a REQUIR
CVE-2017-3142 An error in TSIG authentication can permit unauthorized zone transfers
CVE-2017-3141 Windows service and uninstall paths are not quoted when BIND is installed
CVE-2017-3140 An error processing RPZ rules can cause named to loop endlessly after handling a query
CVE-2017-3138 named exits with a REQUIRE assertion failure if it receives a null command string on its c
CVE-2017-3137 A response packet can cause a resolver to terminate when processing an answer containing a
CVE-2017-3136 An error handling synthesized records could cause an assertion failure when using DNS64 wi
CVE-2017-3135 Combination of DNS64 and RPZ Can Lead to Crash

IV. Related Vulnerabilities

Same product: ISC DHCP
Same vendor: ISC

V. Comments for CVE-2018-5733

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