var-201907-0594
Vulnerability from variot

Mikrotik RouterOS before 6.44.5 (long-term release tree) is vulnerable to stack exhaustion. By sending a crafted HTTP request, an authenticated remote attacker can crash the HTTP server via recursive parsing of JSON. Malicious code cannot be injected. Mikrotik RouterOS Contains a resource exhaustion vulnerability.Service operation interruption (DoS) There is a possibility of being put into a state. MikroTik RouterOS is a Linux-based router operating system developed by Latvian MikroTik Company. The system can be deployed in a PC so that it provides router functionality. A security vulnerability exists in Mikrotik RouterOS versions prior to 6.44.5. Advisory: two vulnerabilities found in MikroTik's RouterOS

Details

Product: MikroTik's RouterOS Affected Versions: before 6.44.5 (Long-term release tree), before 6.45.1 (Stable release tree) Fixed Versions: 6.44.5 (Long-term release tree), 6.45.1 (Stable release tree) Vendor URL: https://mikrotik.com/download/changelogs/long-term-release-tree Vendor Status: fixed version released CVE: CVE-2019-13954, CVE-2019-13955 Credit: Qian Chen(@cq674350529) of the Qihoo 360 Nirvan Team

Product Description

RouterOS is the operating system used on the MikroTik's devices, such as switch, router and access point.

  1. CVE-2019-13954: memory exhaustion via a crafted POST request This vulnerability is similiar to the CVE-2018-1157. An authenticated user can cause the www binary to consume all memory via a crafted POST request to /jsproxy/upload. It's because of the incomplete fix for the CVE-2018-1157.

Based on the poc for cve_2018_1157 provided by the @Jacob Baines (really appreciate!), crafting a filename ending with many '\x00' can bypass the original fix to trigger the vulnerability.

  1. An authenticated user communicating with the www binary can trigger a stack exhaustion vulnerability via recursive parsing of JSON containing message type M.

Based on the poc for cve_2018_1158 provided by the @Jacob Baines (really appreciate!), crafting an JSON message with type M can trigger the vulnerability. A simple python script to generate the crafted message is as follows.

References

[1] https://mikrotik.com/download/changelogs/long-term-release-tree [2] https://github.com/tenable/routeros

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      }
    },
    "data": "resource management error",
    "sources": [
      {
        "db": "CNNVD",
        "id": "CNNVD-201907-1354"
      }
    ],
    "trust": 0.6
  }
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.