Alibaba Cloud Linux 2.1903 Security Advisory: ALINUX2-SA-2021:0033

Issued: 2021-06-09
Updated: 2021-06-09

Summary

samba security and bug fix update

Severity

Moderate

Description

Package updates are available for Alibaba Cloud Linux 2.1903 that fix the following vulnerabilities:

CVE-2021-20254:
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.

References

Updated Packages