The DNS::GetResult function in dns.cpp in InspIRCd before 2.0.19 allows remote DNS servers to cause a denial of service (netsplit) via an invalid character in a PTR response, as demonstrated by a "\032" (whitespace) character in a hostname.

It was discovered that inspircd, an IRC daemon, incorrectly handled PTR lookups of connecting users. This flaw allowed a remote attacker to crash the application by setting up malformed DNS records, thus causing a denial-of-service,

It was discovered that InspIRCd did not validate the names in DNS responses before using them in inter-server communication. A remote attacker controlling the reverse DNS server for an IRC client could use this for denial of service or possibly for privilege escalation on the IRC network.

InspIRCd appears to have been completely unusable since version 1.1.22+dfsg-4+squeeze1 due to a bug in its build system triggered by (e)glibc versions newer than 2.9. This has also been fixed.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote host is affected by the vulnerability described in GLSA-201512-13 (InspIRCd: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in InspIRCd. Please review       the CVE identifiers referenced below for details.
  Impact :

    A remote attacker could possibly execute arbitrary code with the       privileges of the process, or cause a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

Inspircd reports :

This release fixes the issues discovered since 2.0.18, containing multiple important stability and correctness related improvements, including a fix for a bug which allowed malformed DNS records to cause netsplits on a network.

ID	Name	Product	Family	Severity
90160	Debian DSA-3527-1 : inspircd - security update	Nessus	Debian Local Security Checks	high
87897	Debian DLA-384-1 : inspircd security and regression update	Nessus	Debian Local Security Checks	high
87713	GLSA-201512-13 : InspIRCd: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
87662	FreeBSD : inspircd -- DoS (b808c3a8-ae30-11e5-b864-14dae9d210b8)	Nessus	FreeBSD Local Security Checks	high

Detections

Analytics

CVE-2015-8702

high

Tenable Plugins

high

high

critical

high