QID 352457

Date Published: 2021-07-02

QID 352457: Amazon Linux Security Advisory for samba: ALAS2-2021-1680

<DIV ID="issue_overview"> a flaw was found in samba.
The samba smbd file server must map windows group identities (sids) into unix group ids (gids).
The code that performs this had a flaw that could allow it to read data beyond the end of the array in the case where a negative cache entry had been added to the mapping cache.
This could cause the calling code to return those values into the process token that stores the group membership for a user.
The highest threat from this vulnerability is to data confidentiality and integrity. (
cve-2021-20254 ) </DIV>

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 High - 6.8 severity.
  • CVSS V2 rated as Medium - 4.9 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2-2021-1680 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 352457

    CVE-2021-20254 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2-2021-1680 Amazon Linux 2 URL Logo alas.aws.amazon.com/AL2/ALAS-2021-1680.html
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