7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5 Medium
AI Score
Confidence
Low
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
0.648 Medium
EPSS
Percentile
97.8%
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.
thekelleys.org.uk/dnsmasq/CHANGELOG
thekelleys.org.uk/gitweb/?p=dnsmasq.git%3Ba=commit%3Bh=63437ffbb58837b214b4b92cb1c54bc5f3279928
www.securityfocus.com/bid/101085
www.securityfocus.com/bid/101977
www.securitytracker.com/id/1039474
access.redhat.com/security/vulnerabilities/3199382
cert-portal.siemens.com/productcert/pdf/ssa-689071.pdf
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4TK6DWC53WSU6633EVZL7H4PCWBYHMHK/
security.googleblog.com/2017/10/behind-masq-yet-more-dns-and-dhcp.html
www.mail-archive.com/dnsmasq-discuss%40lists.thekelleys.org.uk/msg11664.html
www.mail-archive.com/dnsmasq-discuss%40lists.thekelleys.org.uk/msg11665.html
www.synology.com/support/security/Synology_SA_17_59_Dnsmasq
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5 Medium
AI Score
Confidence
Low
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
0.648 Medium
EPSS
Percentile
97.8%