The remote Redhat Enterprise Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:2331 advisory.

    The libldb packages provide an extensible library that implements an LDAP-like API to access remote LDAP     servers, or use local TDB databases.

    Security Fix(es):

    * samba: Out of bounds read in AD DC LDAP server (CVE-2021-20277)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

According to the versions of the samba packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - An extensible library that implements an LDAP like API     to access remote LDAPservers, or use local tdb     databases.(CVE-2020-27840)

  - A flaw was found in Samba's libldb. Multiple,     consecutive leading spaces in an LDAP attribute can     lead to an out-of-bounds memory write, leading to a     crash of the LDAP server process handling the request.
    The highest threat from this vulnerability is to system     availability.(CVE-2021-20277)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote SUSE Linux SLED15 / SLES15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3187-1 advisory.

  - A flaw was found in samba. Spaces used in a string around a domain name (DN), while supposed to be     ignored, can cause invalid DN strings with spaces to instead write a zero-byte into out-of-bounds memory,     resulting in a crash. The highest threat from this vulnerability is to system availability.
    (CVE-2020-27840)

  - 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)

  - A flaw was found in Samba's libldb. Multiple, consecutive leading spaces in an LDAP attribute can lead to     an out-of-bounds memory write, leading to a crash of the LDAP server process handling the request. The     highest threat from this vulnerability is to system availability. (CVE-2021-20277)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A flaw was found in Samba's libldb. Multiple, consecutive leading spaces in an LDAP attribute can lead to     an out-of-bounds memory write, leading to a crash of the LDAP server process handling the request. The     highest threat from this vulnerability is to system availability. (CVE-2021-20277)

Note that Nessus relies on the presence of the package as reported by the vendor.

This update for samba fixes the following issues :

CVE-2021-20277: Fixed an out of bounds read in ldb_handler_fold (bsc#1183574).

CVE-2021-20254: Fixed a buffer overrun in sids_to_unixids() (bsc#1184677).

CVE-2020-27840: Fixed an unauthenticated remote heap corruption via bad DNs (bsc#1183572).

Avoid free'ing our own pointer in memcache when memcache_trim attempts to reduce cache size (bsc#1179156).

s3-libads: use dns name to open a ldap session (bsc#1184310).

Adjust smbcacls '--propagate-inheritance' feature to align with upstream (bsc#1178469).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the samba packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - A NULL pointer dereference, or possible use-after-free     flaw was found in Samba AD LDAP server in versions     before 4.10.17, before 4.11.11 and before 4.12.4.
    Although some versions of Samba shipped with Red Hat     Enterprise Linux do not support Samba in AD mode, the     affected code is shipped with the libldb package. This     flaw allows an authenticated user to possibly trigger a     use-after-free or NULL pointer dereference. The highest     threat from this vulnerability is to system     availability.(CVE-2020-10730)

  - A flaw was found in Samba's libldb. Multiple,     consecutive leading spaces in an LDAP attribute can     lead to an out-of-bounds memory write, leading to a     crash of the LDAP server process handling the request.
    The highest threat from this vulnerability is to system     availability.(CVE-2021-20277)

  - A flaw was found in samba. Spaces used in a string     around a domain name (DN), while supposed to be     ignored, can cause invalid DN strings with spaces to     instead write a zero-byte into out-of-bounds memory,     resulting in a crash. The highest threat from this     vulnerability is to system     availability.(CVE-2020-27840)

  - 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)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Published	Updated	Severity
150377	RHEL 7 : libldb (RHSA-2021:2331)	Nessus	Red Hat Local Security Checks	6/9/2021	11/7/2024	high
151261	EulerOS 2.0 SP9 : samba (EulerOS-SA-2021-2066)	Nessus	Huawei Local Security Checks	7/1/2021	12/11/2023	high
153580	SUSE SLED15 / SLES15 Security Update : samba (SUSE-SU-2021:3187-1)	Nessus	SuSE Local Security Checks	9/23/2021	7/13/2023	medium
223652	Linux Distros Unpatched Vulnerability : CVE-2021-20277	Nessus	Misc.	3/4/2025	3/4/2025	high
149270	SUSE SLES15 Security Update : samba (SUSE-SU-2021:1498-1)	Nessus	SuSE Local Security Checks	5/5/2021	1/26/2022	medium
153277	EulerOS 2.0 SP2 : samba (EulerOS-SA-2021-2446)	Nessus	Huawei Local Security Checks	9/14/2021	9/16/2021	medium

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