Critical: samba

Issue Overview:

A flaw was found in the way samba implemented SMB1 authentication. An attacker could use this flaw to retrieve the plaintext password sent over the wire even if Kerberos authentication was required. (CVE-2016-2124)

A flaw was found in the way Samba maps domain users to local users. An authenticated attacker could use this flaw to cause possible privilege escalation. (CVE-2020-25717)

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)

Out-of-bounds heap read/write vulnerability in VFS module vfs_fruit allows code execution (CVE-2021-44142)

Affected Packages:

samba

Issue Correction:
Run yum update samba to update your system.

New Packages:

i686:  
    ctdb-tests-4.10.16-18.59.amzn1.i686  
    libwbclient-4.10.16-18.59.amzn1.i686  
    samba-python-4.10.16-18.59.amzn1.i686  
    ctdb-4.10.16-18.59.amzn1.i686  
    samba-client-libs-4.10.16-18.59.amzn1.i686  
    samba-common-libs-4.10.16-18.59.amzn1.i686  
    samba-winbind-clients-4.10.16-18.59.amzn1.i686  
    libwbclient-devel-4.10.16-18.59.amzn1.i686  
    samba-devel-4.10.16-18.59.amzn1.i686  
    libsmbclient-devel-4.10.16-18.59.amzn1.i686  
    samba-test-libs-4.10.16-18.59.amzn1.i686  
    samba-test-4.10.16-18.59.amzn1.i686  
    samba-debuginfo-4.10.16-18.59.amzn1.i686  
    samba-4.10.16-18.59.amzn1.i686  
    samba-winbind-modules-4.10.16-18.59.amzn1.i686  
    samba-winbind-krb5-locator-4.10.16-18.59.amzn1.i686  
    libsmbclient-4.10.16-18.59.amzn1.i686  
    samba-winbind-4.10.16-18.59.amzn1.i686  
    samba-common-tools-4.10.16-18.59.amzn1.i686  
    samba-libs-4.10.16-18.59.amzn1.i686  
    samba-krb5-printing-4.10.16-18.59.amzn1.i686  
    samba-client-4.10.16-18.59.amzn1.i686  
    samba-python-test-4.10.16-18.59.amzn1.i686  
  
noarch:  
    samba-pidl-4.10.16-18.59.amzn1.noarch  
    samba-common-4.10.16-18.59.amzn1.noarch  
  
src:  
    samba-4.10.16-18.59.amzn1.src  
  
x86_64:  
    samba-4.10.16-18.59.amzn1.x86_64  
    samba-winbind-clients-4.10.16-18.59.amzn1.x86_64  
    libsmbclient-4.10.16-18.59.amzn1.x86_64  
    libwbclient-devel-4.10.16-18.59.amzn1.x86_64  
    libsmbclient-devel-4.10.16-18.59.amzn1.x86_64  
    samba-winbind-4.10.16-18.59.amzn1.x86_64  
    samba-test-libs-4.10.16-18.59.amzn1.x86_64  
    samba-winbind-krb5-locator-4.10.16-18.59.amzn1.x86_64  
    samba-python-test-4.10.16-18.59.amzn1.x86_64  
    samba-debuginfo-4.10.16-18.59.amzn1.x86_64  
    libwbclient-4.10.16-18.59.amzn1.x86_64  
    ctdb-4.10.16-18.59.amzn1.x86_64  
    samba-client-4.10.16-18.59.amzn1.x86_64  
    samba-devel-4.10.16-18.59.amzn1.x86_64  
    samba-test-4.10.16-18.59.amzn1.x86_64  
    samba-krb5-printing-4.10.16-18.59.amzn1.x86_64  
    samba-client-libs-4.10.16-18.59.amzn1.x86_64  
    samba-libs-4.10.16-18.59.amzn1.x86_64  
    samba-winbind-modules-4.10.16-18.59.amzn1.x86_64  
    samba-python-4.10.16-18.59.amzn1.x86_64  
    samba-common-libs-4.10.16-18.59.amzn1.x86_64  
    ctdb-tests-4.10.16-18.59.amzn1.x86_64  
    samba-common-tools-4.10.16-18.59.amzn1.x86_64  

Additional References

Red Hat: CVE-2016-2124, CVE-2020-25717, CVE-2021-20254, CVE-2021-44142

Mitre: CVE-2016-2124, CVE-2020-25717, CVE-2021-20254, CVE-2021-44142