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Amazon Linux AMI 2: CVE-2023-4091: Security patch for samba (ALAS-2023-2367)

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Amazon Linux AMI 2: CVE-2023-4091: Security patch for samba (ALAS-2023-2367)

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
11/03/2023
Created
12/06/2023
Added
12/05/2023
Modified
12/05/2023

Description

A vulnerability was discovered in Samba, where the flaw allows SMB clients to truncate files, even with read-only permissions when the Samba VFS module "acl_xattr" is configured with "acl_xattr:ignore system acls = yes". The SMB protocol allows opening files when the client requests read-only access but then implicitly truncates the opened file to 0 bytes if the client specifies a separate OVERWRITE create disposition request. The issue arises in configurations that bypass kernel file system permissions checks, relying solely on Samba's permissions.

Solution(s)

  • amazon-linux-ami-2-upgrade-ctdb
  • amazon-linux-ami-2-upgrade-ctdb-tests
  • amazon-linux-ami-2-upgrade-libsmbclient
  • amazon-linux-ami-2-upgrade-libsmbclient-devel
  • amazon-linux-ami-2-upgrade-libwbclient
  • amazon-linux-ami-2-upgrade-libwbclient-devel
  • amazon-linux-ami-2-upgrade-samba
  • amazon-linux-ami-2-upgrade-samba-client
  • amazon-linux-ami-2-upgrade-samba-client-libs
  • amazon-linux-ami-2-upgrade-samba-common
  • amazon-linux-ami-2-upgrade-samba-common-libs
  • amazon-linux-ami-2-upgrade-samba-common-tools
  • amazon-linux-ami-2-upgrade-samba-dc
  • amazon-linux-ami-2-upgrade-samba-dc-libs
  • amazon-linux-ami-2-upgrade-samba-debuginfo
  • amazon-linux-ami-2-upgrade-samba-devel
  • amazon-linux-ami-2-upgrade-samba-krb5-printing
  • amazon-linux-ami-2-upgrade-samba-libs
  • amazon-linux-ami-2-upgrade-samba-pidl
  • amazon-linux-ami-2-upgrade-samba-python
  • amazon-linux-ami-2-upgrade-samba-python-test
  • amazon-linux-ami-2-upgrade-samba-test
  • amazon-linux-ami-2-upgrade-samba-test-libs
  • amazon-linux-ami-2-upgrade-samba-vfs-glusterfs
  • amazon-linux-ami-2-upgrade-samba-winbind
  • amazon-linux-ami-2-upgrade-samba-winbind-clients
  • amazon-linux-ami-2-upgrade-samba-winbind-krb5-locator
  • amazon-linux-ami-2-upgrade-samba-winbind-modules

References

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