# What is CVE-2018-20523? > CVE-2018-20523 is a medium-severity flaw (CVSS 5.3) in Stock Browser from Mi, published on 7 June 2019. 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 10%. If you run an affected version, plan in the vendor’s fix. Canonical page: https://www.precursorintelligence.com/what-is/cve-2018-20523 ## At a glance - **Verdict:** Fix this soon. Not confirmed as exploited yet, but serious or likely enough that it should not wait for a quiet month. - **Precursor Intelligence risk score:** 43 out of 100 (Medium); action: Plan remediation. Kept up to date as the evidence changes. - **Severity:** Medium (CVSS 5.3 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:** 10% (latest exploit-likelihood forecast) - **Published:** 7 June 2019 - **Record last updated:** 19 April 2022 - **Main product:** Stock Browser from Mi - **Affected products:** 37 ## What is CVE-2018-20523? 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 some data. ### The official description Xiaomi Stock Browser 10.2.4.g on Xiaomi Redmi Note 5 Pro devices and other Redmi Android phones allows content provider injection. In other words, a third-party application can read the user's cleartext browser history via an app.provider.query content://com.android.browser.searchhistory/searchhistory request. ### What kind of flaw is it? - CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') ### 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 some data Severity vector: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N` ## Is CVE-2018-20523 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 10%. That can change at any time, which is why we keep watching. Exploit likelihood over the last 7 days: 10%, 10%, 10%, 10%, 10%, 10%, 10%. ### Timeline - 7 June 2019: Published - 19 April 2022: Record last updated ### How Precursor Intelligence ranks it CVE-2018-20523 scores **43 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: smaller factor - Threat activity around it: smaller factor 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-2018-20523? The published record lists 37 products. - [Stock Browser](https://www.precursorintelligence.com/product/mi/stock_browser) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Application): 10.2.4g - [Redmi 4a](https://www.precursorintelligence.com/product/mi/redmi_4a) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Hardware): version not specified - [Redmi 4a Firmware](https://www.precursorintelligence.com/product/mi/redmi_4a_firmware) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Operating system): version not specified - [Redmi 5 Plus](https://www.precursorintelligence.com/product/mi/redmi_5_plus) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Hardware): version not specified - [Redmi 5 Plus Firmware](https://www.precursorintelligence.com/product/mi/redmi_5_plus_firmware) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Operating system): version not specified - [Redmi 6](https://www.precursorintelligence.com/product/mi/redmi_6) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Hardware): version not specified - [Redmi 6 Firmware](https://www.precursorintelligence.com/product/mi/redmi_6_firmware) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Operating system): version not specified - [Redmi 6a](https://www.precursorintelligence.com/product/mi/redmi_6a) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Hardware): version not specified - [Redmi 6a Firmware](https://www.precursorintelligence.com/product/mi/redmi_6a_firmware) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Operating system): version not specified - [Redmi 7](https://www.precursorintelligence.com/product/mi/redmi_7) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Hardware): version not specified - [Redmi 7 Firmware](https://www.precursorintelligence.com/product/mi/redmi_7_firmware) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Operating system): version not specified - [Redmi 7a](https://www.precursorintelligence.com/product/mi/redmi_7a) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Hardware): version not specified - [Redmi 7a Firmware](https://www.precursorintelligence.com/product/mi/redmi_7a_firmware) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Operating system): version not specified - [Redmi Go](https://www.precursorintelligence.com/product/mi/redmi_go) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Hardware): version not specified - [Redmi Go Firmware](https://www.precursorintelligence.com/product/mi/redmi_go_firmware) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Operating system): version not specified - [Redmi K20](https://www.precursorintelligence.com/product/mi/redmi_k20) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Hardware): version not specified - [Redmi K20 Firmware](https://www.precursorintelligence.com/product/mi/redmi_k20_firmware) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Operating system): version not specified - [Redmi K20 Pro](https://www.precursorintelligence.com/product/mi/redmi_k20_pro) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Hardware): version not specified - [Redmi K20 Pro Firmware](https://www.precursorintelligence.com/product/mi/redmi_k20_pro_firmware) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Operating system): version not specified - [Redmi Note 4](https://www.precursorintelligence.com/product/mi/redmi_note_4) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Hardware): version not specified - [Redmi Note 4 Firmware](https://www.precursorintelligence.com/product/mi/redmi_note_4_firmware) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Operating system): version not specified - [Redmi Note 5](https://www.precursorintelligence.com/product/mi/redmi_note_5) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Hardware): version not specified - [Redmi Note 5 Firmware](https://www.precursorintelligence.com/product/mi/redmi_note_5_firmware) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Operating system): version not specified - [Redmi Note 5 Pro](https://www.precursorintelligence.com/product/mi/redmi_note_5_pro) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Hardware): version not specified - [Redmi Note 5 Pro Firmware](https://www.precursorintelligence.com/product/mi/redmi_note_5_pro_firmware) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Operating system): version not specified - [Redmi Note 5a Prime](https://www.precursorintelligence.com/product/mi/redmi_note_5a_prime) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Hardware): version not specified - [Redmi Note 5a Prime Firmware](https://www.precursorintelligence.com/product/mi/redmi_note_5a_prime_firmware) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Operating system): version not specified - [Redmi Note 6 Pro](https://www.precursorintelligence.com/product/mi/redmi_note_6_pro) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Hardware): version not specified - [Redmi Note 6 Pro Firmware](https://www.precursorintelligence.com/product/mi/redmi_note_6_pro_firmware) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Operating system): version not specified - [Redmi Note 7](https://www.precursorintelligence.com/product/mi/redmi_note_7) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Hardware): version not specified - [Redmi Note 7 Firmware](https://www.precursorintelligence.com/product/mi/redmi_note_7_firmware) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Operating system): version not specified - [Redmi Note 7s](https://www.precursorintelligence.com/product/mi/redmi_note_7s) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Hardware): version not specified - [Redmi Note 7s Firmware](https://www.precursorintelligence.com/product/mi/redmi_note_7s_firmware) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Operating system): version not specified - [Redmi S2](https://www.precursorintelligence.com/product/mi/redmi_s2) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Hardware): version not specified - [Redmi S2 Firmware](https://www.precursorintelligence.com/product/mi/redmi_s2_firmware) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Operating system): version not specified - [Redmi Y3](https://www.precursorintelligence.com/product/mi/redmi_y3) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Hardware): version not specified - [Redmi Y3 Firmware](https://www.precursorintelligence.com/product/mi/redmi_y3_firmware) by [Mi](https://www.precursorintelligence.com/vendors/mi) (Operating system): version not specified ## How do I fix CVE-2018-20523? 1. **Check whether you run it.** Compare your versions with the affected products above. Not sure what you run? Precursor Intelligence 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 - [sec.xiaomi.com](https://sec.xiaomi.com) (Broken link, Vendor advisory) - [packetstormsecurity.com](http://packetstormsecurity.com/files/163796/Xiaomi-10.2.4.g-Information-Disclosure.html) (Exploit, Third-party advisory, Vulnerability database) - [vishwarajbhattrai.wordpress.com](https://vishwarajbhattrai.wordpress.com/2019/03/22/content-provider-injection-in-xiaomi-stock-browser) (Exploit, Third-party advisory) ## Questions ### What is CVE-2018-20523? CVE-2018-20523 is a medium-severity flaw in Stock Browser from Mi, published on 7 June 2019. 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 some data. ### How serious is CVE-2018-20523? It scores 5.3 out of 10 on the CVSS severity scale, which is medium. Our risk score for CVE-2018-20523 is 43 out of 100, which is Medium. Its action is "Plan remediation". Not confirmed as exploited yet, but serious or likely enough that it should not wait for a quiet month. ### Is CVE-2018-20523 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 10%. That can change at any time, which is why we keep watching. ### Which versions does CVE-2018-20523 affect? For Stock Browser from Mi: 10.2.4g. The record lists 37 products in all, each with its versions, under "Who is affected" on this page. ### How do I fix CVE-2018-20523? 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-2018-20523 affect you? Precursor Intelligence 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. Start free (no card, nothing to install): https://www.precursorintelligence.com/register Book a demo: https://www.precursorintelligence.com/contact