DLA-3563-1

Source

https://storage.googleapis.com/debian-osv/dla-osv/DLA-3563-1.json

Published

2023-09-14T00:00:00Z

Modified

2023-09-14T12:17:55.610768Z

Details

Several vulnerabilities were discovered in Samba, the SMB/CIFS file, print, and login server for Unix.

• CVE-2016-2124 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-2019-10218 A flaw was found in the samba client, all samba versions before samba 4.11.2, 4.10.10 and 4.9.15, where a malicious server can supply a pathname to the client with separators. This could allow the client to access files and folders outside of the SMB network pathnames. An attacker could use this vulnerability to create files outside of the current working directory using the privileges of the client user.
• CVE-2019-14833 A flaw was found in Samba, all versions starting samba 4.5.0 before samba 4.9.15, samba 4.10.10, samba 4.11.2, in the way it handles a user password change or a new password for a samba user. The Samba Active Directory Domain Controller can be configured to use a custom script to check for password complexity. This configuration can fail to verify password complexity when non-ASCII characters are used in the password, which could lead to weak passwords being set for samba users, making it vulnerable to dictionary attacks.
• CVE-2019-14847 A flaw was found in samba 4.0.0 before samba 4.9.15 and samba 4.10.x before 4.10.10. An attacker can crash AD DC LDAP server via dirsync resulting in denial of service. Privilege escalation is not possible with this issue.
• CVE-2019-14902 There is an issue in all samba 4.11.x versions before 4.11.5, all samba 4.10.x versions before 4.10.12 and all samba 4.9.x versions before 4.9.18, where the removal of the right to create or modify a subtree would not automatically be taken away on all domain controllers.
• CVE-2019-14907 All samba versions 4.9.x before 4.9.18, 4.10.x before 4.10.12 and 4.11.x before 4.11.5 have an issue where if it is set with "log level = 3" (or above) then the string obtained from the client, after a failed character conversion, is printed. Such strings can be provided during the NTLMSSP authentication exchange. In the Samba AD DC in particular, this may cause a long-lived process(such as the RPC server) to terminate. (In the file server case, the most likely target, smbd, operates as process-per-client and so a crash there is harmless).
• CVE-2019-19344 There is a use-after-free issue in all samba 4.9.x versions before 4.9.18, all samba 4.10.x versions before 4.10.12 and all samba 4.11.x versions before 4.11.5, essentially due to a call to realloc() while other local variables still point at the original buffer.

For Debian 10 buster, these problems have been fixed in version 2:4.9.5+dfsg-5+deb10u4.

We recommend that you upgrade your samba packages.

Admins of AD DC setups are reminded and strongly encouraged to upgrade to bullseye and then bookworm, as AD DC setups are unsupported in buster since DSA 5015-1, and in bullseye since DSA 5477-1.

For the detailed security status of samba please refer to its security tracker page at: https://security-tracker.debian.org/tracker/samba

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS

References

• https://www.debian.org/lts/security/2023/dla-3563