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amazonAmazonALAS2-2021-1680
HistoryJul 01, 2021 - 1:06 a.m.

Medium: samba

2021-07-0101:06:00
alas.aws.amazon.com
20

6.8 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

6.9 Medium

AI Score

Confidence

High

4.9 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:S/C:P/I:P/A:N

0.004 Low

EPSS

Percentile

74.0%

JSON

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)

Affected Packages:

samba

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

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

New Packages:

aarch64:  
    samba-4.10.16-15.amzn2.0.1.aarch64  
    samba-client-4.10.16-15.amzn2.0.1.aarch64  
    samba-client-libs-4.10.16-15.amzn2.0.1.aarch64  
    samba-common-libs-4.10.16-15.amzn2.0.1.aarch64  
    samba-common-tools-4.10.16-15.amzn2.0.1.aarch64  
    samba-dc-4.10.16-15.amzn2.0.1.aarch64  
    samba-dc-libs-4.10.16-15.amzn2.0.1.aarch64  
    samba-devel-4.10.16-15.amzn2.0.1.aarch64  
    samba-krb5-printing-4.10.16-15.amzn2.0.1.aarch64  
    samba-libs-4.10.16-15.amzn2.0.1.aarch64  
    libsmbclient-4.10.16-15.amzn2.0.1.aarch64  
    libsmbclient-devel-4.10.16-15.amzn2.0.1.aarch64  
    libwbclient-4.10.16-15.amzn2.0.1.aarch64  
    libwbclient-devel-4.10.16-15.amzn2.0.1.aarch64  
    samba-python-4.10.16-15.amzn2.0.1.aarch64  
    samba-python-test-4.10.16-15.amzn2.0.1.aarch64  
    samba-test-4.10.16-15.amzn2.0.1.aarch64  
    samba-test-libs-4.10.16-15.amzn2.0.1.aarch64  
    samba-winbind-4.10.16-15.amzn2.0.1.aarch64  
    samba-winbind-clients-4.10.16-15.amzn2.0.1.aarch64  
    samba-winbind-krb5-locator-4.10.16-15.amzn2.0.1.aarch64  
    samba-winbind-modules-4.10.16-15.amzn2.0.1.aarch64  
    ctdb-4.10.16-15.amzn2.0.1.aarch64  
    ctdb-tests-4.10.16-15.amzn2.0.1.aarch64  
    samba-debuginfo-4.10.16-15.amzn2.0.1.aarch64  
  
i686:  
    samba-4.10.16-15.amzn2.0.1.i686  
    samba-client-4.10.16-15.amzn2.0.1.i686  
    samba-client-libs-4.10.16-15.amzn2.0.1.i686  
    samba-common-libs-4.10.16-15.amzn2.0.1.i686  
    samba-common-tools-4.10.16-15.amzn2.0.1.i686  
    samba-dc-4.10.16-15.amzn2.0.1.i686  
    samba-dc-libs-4.10.16-15.amzn2.0.1.i686  
    samba-devel-4.10.16-15.amzn2.0.1.i686  
    samba-krb5-printing-4.10.16-15.amzn2.0.1.i686  
    samba-libs-4.10.16-15.amzn2.0.1.i686  
    libsmbclient-4.10.16-15.amzn2.0.1.i686  
    libsmbclient-devel-4.10.16-15.amzn2.0.1.i686  
    libwbclient-4.10.16-15.amzn2.0.1.i686  
    libwbclient-devel-4.10.16-15.amzn2.0.1.i686  
    samba-python-4.10.16-15.amzn2.0.1.i686  
    samba-python-test-4.10.16-15.amzn2.0.1.i686  
    samba-test-4.10.16-15.amzn2.0.1.i686  
    samba-test-libs-4.10.16-15.amzn2.0.1.i686  
    samba-winbind-4.10.16-15.amzn2.0.1.i686  
    samba-winbind-clients-4.10.16-15.amzn2.0.1.i686  
    samba-winbind-krb5-locator-4.10.16-15.amzn2.0.1.i686  
    samba-winbind-modules-4.10.16-15.amzn2.0.1.i686  
    ctdb-4.10.16-15.amzn2.0.1.i686  
    ctdb-tests-4.10.16-15.amzn2.0.1.i686  
    samba-debuginfo-4.10.16-15.amzn2.0.1.i686  
  
noarch:  
    samba-common-4.10.16-15.amzn2.0.1.noarch  
    samba-pidl-4.10.16-15.amzn2.0.1.noarch  
  
src:  
    samba-4.10.16-15.amzn2.0.1.src  
  
x86_64:  
    samba-4.10.16-15.amzn2.0.1.x86_64  
    samba-client-4.10.16-15.amzn2.0.1.x86_64  
    samba-client-libs-4.10.16-15.amzn2.0.1.x86_64  
    samba-common-libs-4.10.16-15.amzn2.0.1.x86_64  
    samba-common-tools-4.10.16-15.amzn2.0.1.x86_64  
    samba-dc-4.10.16-15.amzn2.0.1.x86_64  
    samba-dc-libs-4.10.16-15.amzn2.0.1.x86_64  
    samba-devel-4.10.16-15.amzn2.0.1.x86_64  
    samba-vfs-glusterfs-4.10.16-15.amzn2.0.1.x86_64  
    samba-krb5-printing-4.10.16-15.amzn2.0.1.x86_64  
    samba-libs-4.10.16-15.amzn2.0.1.x86_64  
    libsmbclient-4.10.16-15.amzn2.0.1.x86_64  
    libsmbclient-devel-4.10.16-15.amzn2.0.1.x86_64  
    libwbclient-4.10.16-15.amzn2.0.1.x86_64  
    libwbclient-devel-4.10.16-15.amzn2.0.1.x86_64  
    samba-python-4.10.16-15.amzn2.0.1.x86_64  
    samba-python-test-4.10.16-15.amzn2.0.1.x86_64  
    samba-test-4.10.16-15.amzn2.0.1.x86_64  
    samba-test-libs-4.10.16-15.amzn2.0.1.x86_64  
    samba-winbind-4.10.16-15.amzn2.0.1.x86_64  
    samba-winbind-clients-4.10.16-15.amzn2.0.1.x86_64  
    samba-winbind-krb5-locator-4.10.16-15.amzn2.0.1.x86_64  
    samba-winbind-modules-4.10.16-15.amzn2.0.1.x86_64  
    ctdb-4.10.16-15.amzn2.0.1.x86_64  
    ctdb-tests-4.10.16-15.amzn2.0.1.x86_64  
    samba-debuginfo-4.10.16-15.amzn2.0.1.x86_64

Additional References

Red Hat: CVE-2021-20254

Mitre: CVE-2021-20254

OSVersionArchitecturePackageVersionFilename
Amazon Linux2aarch64samba< 4.10.16-15.amzn2.0.1samba-4.10.16-15.amzn2.0.1.aarch64.rpm
Amazon Linux2aarch64samba-client< 4.10.16-15.amzn2.0.1samba-client-4.10.16-15.amzn2.0.1.aarch64.rpm
Amazon Linux2aarch64samba-client-libs< 4.10.16-15.amzn2.0.1samba-client-libs-4.10.16-15.amzn2.0.1.aarch64.rpm
Amazon Linux2aarch64samba-common-libs< 4.10.16-15.amzn2.0.1samba-common-libs-4.10.16-15.amzn2.0.1.aarch64.rpm
Amazon Linux2aarch64samba-common-tools< 4.10.16-15.amzn2.0.1samba-common-tools-4.10.16-15.amzn2.0.1.aarch64.rpm
Amazon Linux2aarch64samba-dc< 4.10.16-15.amzn2.0.1samba-dc-4.10.16-15.amzn2.0.1.aarch64.rpm
Amazon Linux2aarch64samba-dc-libs< 4.10.16-15.amzn2.0.1samba-dc-libs-4.10.16-15.amzn2.0.1.aarch64.rpm
Amazon Linux2aarch64samba-devel< 4.10.16-15.amzn2.0.1samba-devel-4.10.16-15.amzn2.0.1.aarch64.rpm
Amazon Linux2aarch64samba-krb5-printing< 4.10.16-15.amzn2.0.1samba-krb5-printing-4.10.16-15.amzn2.0.1.aarch64.rpm
Amazon Linux2aarch64samba-libs< 4.10.16-15.amzn2.0.1samba-libs-4.10.16-15.amzn2.0.1.aarch64.rpm
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6.8 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

6.9 Medium

AI Score

Confidence

High

4.9 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:S/C:P/I:P/A:N

0.004 Low

EPSS

Percentile

74.0%

JSON
Related for ALAS2-2021-1680
altlinux2oraclelinux2prion1nessus48redhat6fedora3openvas34centos1ibm4osv6freebsd1almalinux1cbl_mariner1cisa1ubuntucve1rocky1ubuntu2veracode1cve1alpinelinux1debiancve1samba1redhatcve1suse2mageia1gentoo1amazon1debian1rosalinux1