CVE-2017-13704

HIGH

Canonical Ubuntu Linux < 2.77 - Improper Input Validation

Title source: rule

Description

In dnsmasq before 2.78, if the DNS packet size does not match the expected size, the size parameter in a memset call gets a negative value. As it is an unsigned value, memset ends up writing up to 0xffffffff zero's (0xffffffffffffffff in 64 bit platforms), making dnsmasq crash.

References (12)

[Release Notes, Vendor Advisory] http://thekelleys.org.uk/dnsmasq/CHANGELOG

[Various Sources] http://thekelleys.org.uk/gitweb/?p=dnsmasq.git%3Ba=commit%3Bh=63437ffbb58837b214b4b92cb1c54bc5f3279928

[Third Party Advisory, VDB Entry] http://www.securityfocus.com/bid/101085

[Third Party Advisory, VDB Entry] http://www.securitytracker.com/id/1039474

[Issue Tracking, Third Party Advisory] https://access.redhat.com/security/vulnerabilities/3199382

[Vendor Advisory] https://cert-portal.siemens.com/productcert/pdf/ssa-689071.pdf

[Third Party Advisory] https://security.googleblog.com/2017/10/behind-masq-yet-more-dns-and-dhcp.html

[Mailing List] https://www.mail-archive.com/dnsmasq-discuss%40lists.thekelleys.org.uk/msg11664.html

[Mailing List] https://www.mail-archive.com/dnsmasq-discuss%40lists.thekelleys.org.uk/msg11665.html

[Various Sources] https://www.synology.com/support/security/Synology_SA_17_59_Dnsmasq

[Third Party Advisory, VDB Entry] http://www.securityfocus.com/bid/101977

[Mailing List, Third Party Advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4TK6DWC53WSU6633EVZL7H4PCWBYHMHK/

Scores

CVSS v3 7.5

EPSS 0.8175

EPSS Percentile 99.2%

Attack Vector NETWORK

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Classification

CWE

CWE-20

Status draft

Affected Products (13)

canonical/ubuntu_linux

canonical/ubuntu_linux

canonical/ubuntu_linux

debian/debian_linux

debian/debian_linux

debian/debian_linux

fedoraproject/fedora

novell/leap

novell/leap

redhat/enterprise_linux_desktop

redhat/enterprise_linux_server

redhat/enterprise_linux_workstation

thekelleys/dnsmasq < 2.77

Timeline

Published Oct 03, 2017

Tracked Since Feb 18, 2026