critical
9.8
CWE
20
Advisory Published
CVE Published
Updated

CVE-2015-7705: Input Validation

First published: Thu Oct 22 2015(Updated: )

A flaw was found in the way NTP handled rate limiting. An attacker able to send a large number of crafted requests to an NTP server could trigger the rate limiting on that server, and prevent clients from getting a usable reply from the server. The default NTP configuration in Red Hat Enterprise Linux does not enable rate limiting. External References: <a href="https://www.cs.bu.edu/~goldbe/NTPattack.html">https://www.cs.bu.edu/~goldbe/NTPattack.html</a>

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
redhat/ntp<4.2.8
4.2.8
Siemens TIM 4R-IE
Siemens TIM 4R-IE DNP3
Siemens Simatic Net CP 443-1 OPC UA Firmware
NTP>=4.2.0<4.2.8
NTP>=4.3.0<4.3.77
NTP=4.2.8
NTP=4.2.8-p1
NTP=4.2.8-p1-beta1
NTP=4.2.8-p1-beta2
NTP=4.2.8-p1-beta3
NTP=4.2.8-p1-beta4
NTP=4.2.8-p1-beta5
NTP=4.2.8-p1-rc1
NTP=4.2.8-p1-rc2
NTP=4.2.8-p2
NTP=4.2.8-p2-rc1
NTP=4.2.8-p2-rc2
NTP=4.2.8-p2-rc3
NTP=4.2.8-p3
NTP=4.2.8-p3-rc1
NTP=4.2.8-p3-rc2
NTP=4.2.8-p3-rc3
NetApp OnCommand Performance Manager
NetApp OnCommand Unified Manager
IBM Data ONTAP
IBM Data ONTAP
XenServer=6.0.2
XenServer=6.2.0
XenServer=6.5
XenServer=7.0
Siemens TIM 4R-IE DNP3
siemens SIMATIC TIM 4R-IE
Siemens TIM 4R-IE
Siemens TIM 4R-IE

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Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2015-7705?

    The severity of CVE-2015-7705 is considered to be high as it can lead to denial of service by exhausting the NTP server's response capabilities.

  • How do I fix CVE-2015-7705?

    To fix CVE-2015-7705, you should upgrade the NTP software to version 4.2.8 or later.

  • What systems are affected by CVE-2015-7705?

    CVE-2015-7705 affects NTP versions prior to 4.2.8 along with specific Siemens TIM and NetApp products.

  • Can CVE-2015-7705 be exploited remotely?

    Yes, CVE-2015-7705 can be exploited remotely by attackers sending crafted requests to an NTP server.

  • What are the potential impacts of CVE-2015-7705?

    The potential impacts of CVE-2015-7705 include denial of service, which can prevent clients from receiving valid time responses from the NTP server.

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