VAR-201907-0594
Vulnerability from variot - Updated: 2023-12-18 11:59Mikrotik 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.
- 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.
- 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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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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