漏洞类别：RedHat
漏洞等级： 
漏洞信息
The Berkeley Internet Name Domain (BIND) is an implementation of the Domain Name System (DNS) protocols. BIND includes a DNS server (named); a resolver library (routines for applications to use when interfacing with DNS); and tools for verifying that the DNS server is operating correctly.
It was found that the lightweight resolver protocol implementation in BIND could enter an infinite recursion and crash when asked to resolve a query name which, when combined with a search list entry, exceeds the maximum allowable length. A remote attacker could use this flaw to crash lwresd or named when using the "lwres" statement in named.conf. (CVE-2016-2775)
Affected Products:
Red Hat Enterprise Linux Server - Extended Update Support 7.3 x86_64
Red Hat Enterprise Linux Server - Extended Update Support 7.2 x86_64
Red Hat Enterprise Linux Server - AUS 7.2 x86_64
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.2 s390x
Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.3 ppc64
Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.2 ppc64
Red Hat Enterprise Linux EUS Compute Node 7.3 x86_64
Red Hat Enterprise Linux EUS Compute Node 7.2 x86_64
Red Hat Enterprise Linux Server - AUS 7.3 x86_64
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.3 s390x
Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.3 ppc64le
Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.2 ppc64le
Red Hat Enterprise Linux Server - TUS 7.3 x86_64
Red Hat Enterprise Linux Server - TUS 7.2 x86_64
漏洞危害
A remote attacker could use this flaw to crash lwresd or named when using the "lwres" statement in named.conf.
解决方案
Upgrade to the latest packages which contain a patch. Refer to Applying Package Updates to RHEL system for details.
Refer to Red Hat security advisory RHSA-2017:2533 to address this issue and obtain more information.
Patch:
Following are links for downloading patches to fix the vulnerabilities:
0daybank
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