Vulnerability identifier: #VU33963

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2011-1910

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
ISC BIND
Server applications / DNS servers

Vendor: ISC

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

Off-by-one error in named in ISC BIND 9.x before 9.7.3-P1, 9.8.x before 9.8.0-P2, 9.4-ESV before 9.4-ESV-R4-P1, and 9.6-ESV before 9.6-ESV-R4-P1 allows remote DNS servers to cause a denial of service (assertion failure and daemon exit) via a negative response containing large RRSIG RRsets.

Mitigation
Install update from vendor's website.

Vulnerable software versions

ISC BIND: 4.9.2 - 9.7.3

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External links
http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061082.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061401.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061405.html
http://marc.info/?l=bugtraq&m=142180687100892&w=2
http://osvdb.org/72540
http://secunia.com/advisories/44677
http://secunia.com/advisories/44719
http://secunia.com/advisories/44741
http://secunia.com/advisories/44744
http://secunia.com/advisories/44758
http://secunia.com/advisories/44762
http://secunia.com/advisories/44783
http://secunia.com/advisories/44929
http://security.freebsd.org/advisories/FreeBSD-SA-11:02.bind.asc
http://slackware.com/security/viewer.php?l=slackware-security&y=2011&m=slackware-security.685026
http://support.apple.com/kb/HT5002
http://www.debian.org/security/2011/dsa-2244
http://www.kb.cert.org/vuls/id/795694
http://www.mandriva.com/security/advisories?name=MDVSA-2011:104
http://www.redhat.com/support/errata/RHSA-2011-0845.html
http://www.securityfocus.com/bid/48007
http://www.securitytracker.com/id?1025572
http://bugzilla.redhat.com/show_bug.cgi?id=708301
http://hermes.opensuse.org/messages/8699912
http://www.isc.org/software/bind/advisories/cve-2011-1910

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.