Out-of-bounds Read Affecting samba package, versions <0:4.10.16-18.59.amzn1


Severity

Recommended
critical

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.16% (54th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-AMZN201803-SAMBA-2407139
  • published19 Feb 2022
  • disclosed5 May 2021

Introduced: 5 May 2021

CVE-2021-20254  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2018.03 samba to version 0:4.10.16-18.59.amzn1 or higher.
This issue was patched in ALAS-2022-1564.

NVD Description

Note: Versions mentioned in the description apply only to the upstream samba package and not the samba package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2018.03 relevant fixed versions and status.

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.

CVSS Scores

version 3.1