CVE-2020-1660 Vulnerability Analysis & Exploit Details

CVE-2020-1660
Vulnerability Scoring

9.9
/10
Critical Risk

As a catastrophic security flaw, CVE-2020-1660 has severe implications, demanding immediate intervention.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Changed
    Successful exploitation can impact components beyond the vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2020-1660 Details

Status: Analyzed

Last updated: 🕕 28 Oct 2020, 18:00 UTC
Originally published on: 🕘 16 Oct 2020, 21:15 UTC

Time between publication and last update: 11 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:H

CVE-2020-1660 Vulnerability Summary

CVE-2020-1660: When DNS filtering is enabled on Juniper Networks Junos MX Series with one of the following cards MS-PIC, MS-MIC or MS-MPC, an incoming stream of packets processed by the Multiservices PIC Management Daemon (mspmand) process, responsible for managing "URL Filtering service", may crash, causing the Services PIC to restart. While the Services PIC is restarting, all PIC services including DNS filtering service (DNS sink holing) will be bypassed until the Services PIC completes its boot process. This vulnerability might allow an attacker to cause an extended Denial of Service (DoS) attack against the device and to cause clients to be vulnerable to DNS based attacks by malicious DNS servers when they send DNS requests through the device. As a result, devices which were once protected by the DNS Filtering service are no longer protected and at risk of exploitation. This issue affects Juniper Networks Junos OS: 17.3 versions prior to 17.3R3-S8; 18.3 versions prior to 18.3R3-S1; 18.4 versions prior to 18.4R3; 19.1 versions prior to 19.1R3; 19.2 versions prior to 19.2R2; 19.3 versions prior to 19.3R3. This issue does not affect Juniper Networks Junos OS 17.4, 18.1, and 18.2.

Assessing the Risk of CVE-2020-1660

Access Complexity Graph

The exploitability of CVE-2020-1660 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2020-1660

With low attack complexity and no required privileges, CVE-2020-1660 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2020-1660, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2020-1660, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: Low
    CVE-2020-1660 could lead to minor leaks of non-critical information without major privacy breaches.
  • Integrity: Low
    Exploiting CVE-2020-1660 may cause minor changes to data without severely impacting its accuracy.
  • Availability: High
    CVE-2020-1660 can disrupt system operations, potentially causing complete denial of service (DoS).

Exploit Prediction Scoring System (EPSS)

The EPSS score estimates the probability that this vulnerability will be exploited in the near future.

EPSS Score: 0.103% (probability of exploit)

EPSS Percentile: 44.34% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 55.66% of others.

CVE-2020-1660 References

External References

CWE Common Weakness Enumeration

CWE-362

CAPEC Common Attack Pattern Enumeration and Classification

  • Leveraging Race Conditions CAPEC-26 The adversary targets a race condition occurring when multiple processes access and manipulate the same resource concurrently, and the outcome of the execution depends on the particular order in which the access takes place. The adversary can leverage a race condition by "running the race", modifying the resource and modifying the normal execution flow. For instance, a race condition can occur while accessing a file: the adversary can trick the system by replacing the original file with their version and cause the system to read the malicious file.
  • Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions CAPEC-29 This attack targets a race condition occurring between the time of check (state) for a resource and the time of use of a resource. A typical example is file access. The adversary can leverage a file access race condition by "running the race", meaning that they would modify the resource between the first time the target program accesses the file and the time the target program uses the file. During that period of time, the adversary could replace or modify the file, causing the application to behave unexpectedly.

Vulnerable Configurations

  • cpe:2.3:o:juniper:junos:17.3:-:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:17.3:-:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:17.3:r1-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:17.3:r1-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:17.3:r2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:17.3:r2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:17.3:r2-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:17.3:r2-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:17.3:r2-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:17.3:r2-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:17.3:r2-s3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:17.3:r2-s3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:17.3:r2-s4:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:17.3:r2-s4:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:17.3:r2-s5:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:17.3:r2-s5:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:17.3:r3:-:*:*:*:*:*
    cpe:2.3:o:juniper:junos:17.3:r3:-:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:17.3:r3-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:17.3:r3-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:17.3:r3-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:17.3:r3-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:17.3:r3-s3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:17.3:r3-s3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:17.3:r3-s4:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:17.3:r3-s4:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:17.3:r3-s7:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:17.3:r3-s7:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:-:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:-:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:r1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:r1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:r1-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:r1-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:r1-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:r1-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:r1-s3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:r1-s3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:r1-s5:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:r1-s5:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:r1-s6:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:r1-s6:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:r2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:r2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:r2-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:r2-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:r2-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:r2-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:r2-s3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:r2-s3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.3:r3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.3:r3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.4:-:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.4:-:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.4:r1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.4:r1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.4:r1-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.4:r1-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.4:r1-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.4:r1-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.4:r1-s5:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.4:r1-s5:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.4:r1-s6:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.4:r1-s6:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.4:r2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.4:r2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.4:r2-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.4:r2-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.4:r2-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.4:r2-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.4:r2-s3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.4:r2-s3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:18.4:r2-s4:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:18.4:r2-s4:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.1:-:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.1:-:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.1:r1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.1:r1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.1:r1-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.1:r1-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.1:r1-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.1:r1-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.1:r1-s3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.1:r1-s3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.1:r1-s4:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.1:r1-s4:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.1:r2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.1:r2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.1:r2-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.1:r2-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.2:-:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.2:-:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.2:r1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.2:r1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.2:r1-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.2:r1-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.2:r1-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.2:r1-s2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.2:r1-s3:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.2:r1-s3:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.3:-:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.3:-:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.3:r1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.3:r1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.3:r1-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.3:r1-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.3:r2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.3:r2:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.3:r2-s1:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.3:r2-s1:*:*:*:*:*:*
  • cpe:2.3:o:juniper:junos:19.3:r2-s2:*:*:*:*:*:*
    cpe:2.3:o:juniper:junos:19.3:r2-s2:*:*:*:*:*:*

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