# What is CVE-2020-8983?

> CVE-2020-8983 is a high-severity flaw (CVSS 7.5) in Sharefile Storagezones Controller from Citrix, published on 7 May 2020. It is not on the list of flaws known to be exploited today. The latest forecast puts its chance of use in the next 30 days at 4.5%. If you run an affected version, plan in the vendor’s fix.

Canonical page: https://www.edgeprotect.io/what-is/cve-2020-8983

## At a glance

- **Verdict:** Plan it in. No sign of exploitation and a low forecast. Patch it in your normal update cycle.
- **EdgeProtect risk score:** 47 out of 100 (Medium); action: Plan remediation. Kept up to date as the evidence changes.
- **Severity:** High (CVSS 7.5 out of 10)
- **Known to be exploited:** No, not on the list of flaws known to be exploited today
- **Chance of use in the next 30 days:** 4.5% (latest exploit-likelihood forecast)
- **Published:** 7 May 2020
- **Record last updated:** 15 May 2020
- **Main product:** Sharefile Storagezones Controller from Citrix
- **Affected products:** 1

## What is CVE-2020-8983? In plain terms

It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can read data.

### The official description

An arbitrary file write issue exists in all versions of Citrix ShareFile StorageZones (aka storage zones) Controller, including the most recent 5.10.x releases as of May 2020, which allows remote code execution. RCE and file access is granted to everything hosted by ShareFile, be it on-premise or inside Citrix Cloud itself (both are internet facing). NOTE: unlike most CVEs, exploitability depends on the product version that was in use when a particular setup step was performed, NOT the product version that is in use during a current assessment of a CVE consumer's product inventory. Specifically, the vulnerability can be exploited if a storage zone was created by one of these product versions: 5.9.0, 5.8.0, 5.7.0, 5.6.0, 5.5.0, or earlier. This CVE differs from CVE-2020-7473 and CVE-2020-8982.

### What kind of flaw is it?

- CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

### How an attack on it works

- Where an attacker can be: Anywhere on the internet
- How hard it is to pull off: Easy: no special conditions
- Login needed first: No login needed
- Does someone have to click: No, nobody has to do anything
- What an attacker gets: Can read data

Severity vector: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`

## Is CVE-2020-8983 being exploited? Not that we know of

It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 4.5%. That can change at any time, which is why we keep watching.

Exploit likelihood over the last 7 days: 4.5%, 4.5%, 4.5%, 4.5%, 4.5%, 4.5%, 4.5%.

### Timeline

- 7 May 2020: Published
- 15 May 2020: Record last updated

### How EdgeProtect ranks it

CVE-2020-8983 scores **47 out of 100 (Medium)**, with the action "Plan remediation".

Every published flaw gets a risk score from 0 to 100, kept up to date as the evidence changes. Four things go into the score, from the one that counts most to the ones that count less:

- Evidence it is being exploited: biggest factor
- How severe it is: strong factor
- How widely exposed it is: key context
- Real threat activity around it: key context

85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score. When this flaw matches software you track, it lands in your list with its score and the reasons behind it.

## Who is affected by CVE-2020-8983?

The published record lists 1 product.

- [Sharefile Storagezones Controller](https://www.edgeprotect.io/product/citrix/sharefile_storagezones_controller) by [Citrix](https://www.edgeprotect.io/vendors/citrix) (Application): up to 5.5.0, 5.6.0, 5.7.0, 5.8.0, 5.9.0

## How do I fix CVE-2020-8983?

1. **Check whether you run it.** Compare your versions with the affected products above. Not sure what you run? EdgeProtect can work it out from your public website, or you can pick it from a list.
2. **Apply the vendor’s fix.** Install the update named in the vendor’s advisory. We’ve put the advisory first in the list.
3. **If you can’t patch today.** Follow any mitigation the vendor publishes, and limit who can reach the affected system from the internet until the update is in.
4. **Keep an eye on it.** Track the product and we tell you as soon as we spot this flaw on the list of exploited flaws, or a jump in its exploit likelihood.

### References

- [support.citrix.com](https://support.citrix.com/article/CTX269106) (Vendor advisory)
- [drive.google.com](https://drive.google.com/file/d/15iy6S8CN9Hku0a2zrcrXK9FAocmQvMwT/view?usp=sharing)
- [linkedin.com](https://www.linkedin.com/posts/jonas-hansen-2a2606b_citrix-sharefile-storage-zones-controller-activity-6663432907455025152-8_w6/)

## Questions

### What is CVE-2020-8983?

CVE-2020-8983 is a high-severity flaw in Sharefile Storagezones Controller from Citrix, published on 7 May 2020. It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can read data.

### How serious is CVE-2020-8983?

It scores 7.5 out of 10 on the CVSS severity scale, which is high. Our risk score for CVE-2020-8983 is 47 out of 100, which is Medium. Its action is "Plan remediation". No sign of exploitation and a low forecast. Patch it in your normal update cycle.

### Is CVE-2020-8983 being exploited?

It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 4.5%. That can change at any time, which is why we keep watching.

### Which versions does CVE-2020-8983 affect?

For Sharefile Storagezones Controller from Citrix: up to 5.5.0, 5.6.0, 5.7.0, 5.8.0, 5.9.0.

### How do I fix CVE-2020-8983?

Install the update the vendor names in its advisory, linked first under "How do I fix" on this page. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet.

## Does CVE-2020-8983 affect you?

EdgeProtect keeps checking for you:

- **Tell us what you run.** Pick your software from a list, or let us work it out from your website.
- **We match it to every flaw.** Over 400,000 published flaws, checked against your list.
- **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it.
- **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools.

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