XSS in Linux Kernel
CVE-2021-42083
An authenticated attacker is able to create alerts that trigger a stored XSS attack. POC * go to the alert manager * open the ITSM tab * add a webhook with the URL/service token value ' -h && id | tee /tmp/ttttttddddssss #' (whitespaces are tab characters) * click add * click apply * create a test alert * The test alert will run the command “id | tee /tmp/ttttttddddssss” as root. * after the test alert inspect /tmp/ttttttddddssss it'll contain the ids of the root user.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (43.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Linux Kernel
- Microsoft Windows
- Osnexus Quantastor — versions 0
Weakness classification (CWE)
References
- www.wbsec.nl/osnexus (technical-description, Third Party Advisory, exploit, third-party-advisory)
- csirt.divd.nl/DIVD-2021-00020/ (third-party-advisory)
- www.osnexus.com/products/software-defined-storage (Product, product)
- csirt.divd.nl/CVE-2021-42083 (technical-description, Third Party Advisory, exploit, third-party-advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2021-42083?
- CVE-2021-42083 is a high-severity vulnerability in Linux Kernel, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2023-07-10.
- How severe is CVE-2021-42083?
- High severity. CVSS v3 base score is 8.7 out of 10.