CVE-2017-13704 Information

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.

CVSS Vector

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

Reference

http://thekelleys.org.uk/dnsmasq/CHANGELOG http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=63437ffbb58837b214b4b92cb1c54bc5f3279928 http://www.securityfocus.com/bid/101085 http://www.securityfocus.com/bid/101977 http://www.securitytracker.com/id/1039474 https://access.redhat.com/security/vulnerabilities/3199382 https://cert-portal.siemens.com/productcert/pdf/ssa-689071.pdf https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4TK6DWC53WSU6633EVZL7H4PCWBYHMHK/ https://security.googleblog.com/2017/10/behind-masq-yet-more-dns-and-dhcp.html https://www.mail-archive.com/dnsmasq-discuss@lists.thekelleys.org.uk/msg11664.html https://www.mail-archive.com/dnsmasq-discuss@lists.thekelleys.org.uk/msg11665.html https://www.synology.com/support/security/Synology_SA_17_59_Dnsmasq

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5