ID CVE-2016-1548
Summary An attacker can spoof a packet from a legitimate ntpd server with an origin timestamp that matches the peer->dst timestamp recorded for that server. After making this switch, the client in NTP 4.2.8p4 and earlier and NTPSec aa48d001683e5b791a743ec9c575aaf7d867a2b0c will reject all future legitimate server responses. It is possible to force the victim client to move time after the mode has been changed. ntpq gives no indication that the mode has been switched.
References
Vulnerable Configurations
  • cpe:2.3:a:ntp:ntp:4.2.8:p4:*:*:*:*:*:*
    cpe:2.3:a:ntp:ntp:4.2.8:p4:*:*:*:*:*:*
CVSS
Base: 6.4 (as of 05-01-2018 - 02:30)
Impact:
Exploitability:
CWE CWE-19
CAPEC
  • Overflow Buffers
    Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
  • XML Nested Payloads
    Applications often need to transform data in and out of the XML format by using an XML parser. It may be possible for an attacker to inject data that may have an adverse effect on the XML parser when it is being processed. By nesting XML data and causing this data to be continuously self-referential, an attacker can cause the XML parser to consume more resources while processing, causing excessive memory consumption and CPU utilization. An attacker's goal is to leverage parser failure to his or her advantage. In most cases this type of an attack will result in a denial of service due to an application becoming unstable, freezing, or crash. However it may be possible to cause a crash resulting in arbitrary code execution, leading to a jump from the data plane to the control plane [R.230.1].
  • XML Oversized Payloads
    Applications often need to transform data in and out of the XML format by using an XML parser. It may be possible for an attacker to inject data that may have an adverse effect on the XML parser when it is being processed. By supplying oversized payloads in input vectors that will be processed by the XML parser, an attacker can cause the XML parser to consume more resources while processing, causing excessive memory consumption and CPU utilization, and potentially cause execution of arbitrary code. An attacker's goal is to leverage parser failure to his or her advantage. In many cases this type of an attack will result in a denial of service due to an application becoming unstable, freezing, or crash. However it is possible to cause a crash resulting in arbitrary code execution, leading to a jump from the data plane to the control plane [R.231.1].
  • XML Client-Side Attack
    Client applications such as web browsers that process HTML data often need to transform data in and out of the XML format by using an XML parser. It may be possible for an attacker to inject data that may have an adverse effect on the XML parser when it is being processed. These adverse effects may include the parser crashing, consuming too much of a resource, executing too slowly, executing code supplied by an attacker, allowing usage of unintended system functionality, etc. An attacker's goal is to leverage parser failure to his or her advantage. In some cases it may be possible to jump from the data plane to the control plane via bad data being passed to an XML parser. [R.484.1]
  • XML Parser Attack
    Applications often need to transform data in and out of the XML format by using an XML parser. It may be possible for an attacker to inject data that may have an adverse effect on the XML parser when it is being processed. These adverse effects may include the parser crashing, consuming too much of a resource, executing too slowly, executing code supplied by an attacker, allowing usage of unintended system functionality, etc. An attacker's goal is to leverage parser failure to his or her advantage. In some cases it may be possible to jump from the data plane to the control plane via bad data being passed to an XML parser. [R.99.1]
Access
VectorComplexityAuthentication
NETWORK LOW NONE
Impact
ConfidentialityIntegrityAvailability
NONE PARTIAL PARTIAL
cvss-vector via4 AV:N/AC:L/Au:N/C:N/I:P/A:P
redhat via4
advisories
  • rhsa
    id RHSA-2016:1141
  • rhsa
    id RHSA-2016:1552
rpms
  • ntp-0:4.2.6p5-22.el7_2.2
  • ntp-doc-0:4.2.6p5-22.el7_2.2
  • ntp-perl-0:4.2.6p5-22.el7_2.2
  • ntpdate-0:4.2.6p5-22.el7_2.2
  • sntp-0:4.2.6p5-22.el7_2.2
  • ntp-0:4.2.6p5-10.el6.1
  • ntp-doc-0:4.2.6p5-10.el6.1
  • ntp-perl-0:4.2.6p5-10.el6.1
  • ntpdate-0:4.2.6p5-10.el6.1
refmap via4
bid 88264
confirm
debian DSA-3629
freebsd FreeBSD-SA-16:16
gentoo GLSA-201607-15
misc http://www.talosintelligence.com/reports/TALOS-2016-0082/
sectrack 1035705
Last major update 05-01-2018 - 02:30
Published 06-01-2017 - 21:59
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