QID 352803

Date Published: 2021-09-13

QID 352803: Amazon Linux Security Advisory for php73: ALAS-2021-1532

Several flaws has been found in php.
The pdo_firebase module does not check the length of the server version string in a response packet causing a stack buffer overflow, does not verify the data and uses the wrong type to cast length leading to a crash, and does not validate the response before calculation of the exec procedure leading to a crash.
The highest threat from this vulnerability is to system availability. (
( CVE-2021-21704) a security issue was found in php in the way it allows to bypass the filter_validate_url check via a crafted url which may lead to ssrf. (
( CVE-2021-21705)




Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Allows unauthorized disclosure of information; allows unauthorized modification; allows disruption of service.

  • CVSS V3 rated as Medium - 4.2 severity.
  • CVSS V2 rated as Medium - 5.4 severity.
    • Solution
    Please refer to Amazon advisory: ALAS-2021-1532 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 352803

    CVE-2021-21704 | CVE-2021-21705 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS-2021-1532 Amazon Linux URL Logo alas.aws.amazon.com/ALAS-2021-1532.html
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