CVE-2017-13704

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.

Category

7.5
CVSS
Severity: High
CVSS 3.0 •
CVSS 2.0 •
EPSS 79.32% Top 5%
Vendor Advisory fedoraproject.org Vendor Advisory org.uk
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://www.securitytracker.com/id/1039474 vdb entry third party advisory
https://www.synology.com/support/security/Synology_SA_17_59_Dnsmasq
https://access.redhat.com/security/vulnerabilities/3199382 issue tracking third party advisory
http://www.securityfocus.com/bid/101085 vdb entry third party advisory
http://www.securityfocus.com/bid/101977 vdb entry
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4TK6DWC53WSU6633EVZL7H4PCWBYHMHK/ vendor advisory
https://www.mail-archive.com/dnsmasq-discuss%40lists.thekelleys.org.uk/msg11665.html mailing list
http://thekelleys.org.uk/gitweb/?p=dnsmasq.git%3Ba=commit%3Bh=63437ffbb58837b214b4b92cb1c54bc5f3279928
http://thekelleys.org.uk/dnsmasq/CHANGELOG release notes vendor advisory
https://security.googleblog.com/2017/10/behind-masq-yet-more-dns-and-dhcp.html third party advisory
https://www.mail-archive.com/dnsmasq-discuss%40lists.thekelleys.org.uk/msg11664.html mailing list
https://cert-portal.siemens.com/productcert/pdf/ssa-689071.pdf

Frequently Asked Questions

What is the severity of CVE-2017-13704?
CVE-2017-13704 has been scored as a high severity vulnerability.
How to fix CVE-2017-13704?
To fix CVE-2017-13704, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-13704 being actively exploited in the wild?
It is possible that CVE-2017-13704 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~79% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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