high
7.5
CWE
20
Advisory Published
Updated

CVE-2017-13704: Input Validation

First published: Mon Oct 02 2017(Updated: )

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.

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Ubuntu=14.04
Ubuntu=16.04
Ubuntu=17.04
Debian=7.0
Debian=7.1
Debian=9.0
Fedora=27
openSUSE=42.2
openSUSE=42.3
Red Hat Enterprise Linux Desktop=7.0
Red Hat Enterprise Linux Server=7.0
Red Hat Enterprise Linux Workstation=7.0
Dnsmasq<=2.77

Remedy

http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=63437ffbb58837b214b4b92cb1c54bc5f3279928

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2017-13704?

    CVE-2017-13704 has been classified as a high severity vulnerability due to its ability to cause a crash in dnsmasq.

  • How do I fix CVE-2017-13704?

    To fix CVE-2017-13704, update dnsmasq to version 2.78 or later.

  • What systems are affected by CVE-2017-13704?

    CVE-2017-13704 affects various versions of dnsmasq prior to 2.78 on systems like Ubuntu, Debian, Fedora, and Red Hat.

  • What does CVE-2017-13704 exploit in dnsmasq?

    CVE-2017-13704 exploits improper handling of DNS packet sizes, leading to a crash due to an erroneous memset call.

  • Is there a workaround for CVE-2017-13704 until I can update?

    As a temporary workaround for CVE-2017-13704, consider restricting external DNS queries or disabling the dnsmasq service until an update can be applied.

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