CVE-2023-34966: Samba: infinite loop in mdssvc rpc service for spotlight
First published: Thu Jul 13 2023(Updated: )
An infinite loop vulnerability was found in Samba's mdssvc RPC service for Spotlight. When parsing Spotlight mdssvc RPC packets sent by the client, the core unmarshalling function sl_unpack_loop() did not validate a field in the network packet that contains the count of elements in an array-like structure. By passing 0 as the count value, the attacked function will run in an endless loop consuming 100% CPU. This flaw allows an attacker to issue a malformed RPC request, triggering an infinite loop, resulting in a denial of service condition.
Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ubuntu/samba | <2:4.15.13+dfsg-0ubuntu0.20.04.3 | 2:4.15.13+dfsg-0ubuntu0.20.04.3 |
| ubuntu/samba | <2:4.15.13+dfsg-0ubuntu1.2 | 2:4.15.13+dfsg-0ubuntu1.2 |
| ubuntu/samba | <2:4.16.8+dfsg-0ubuntu1.2 | 2:4.16.8+dfsg-0ubuntu1.2 |
| ubuntu/samba | <2:4.17.7+dfsg-1ubuntu1.1 | 2:4.17.7+dfsg-1ubuntu1.1 |
| ubuntu/samba | <2:4.18.5+dfsg-1ubuntu1 | 2:4.18.5+dfsg-1ubuntu1 |
| debian/samba | <=2:4.9.5+dfsg-5+deb10u3<=2:4.9.5+dfsg-5+deb10u4<=2:4.13.13+dfsg-1~deb11u5 | 2:4.17.12+dfsg-0+deb12u1 2:4.19.3+dfsg-2 |
| redhat/samba | <4.16.11 | 4.16.11 |
| redhat/samba | <4.17.10 | 4.17.10 |
| redhat/samba | <4.18.5 | 4.18.5 |
| Samba | <4.16.11 | |
| Samba | >=4.17.0<4.17.10 | |
| Samba | >=4.18.0<4.18.5 | |
| Fedoraproject Fedora | =38 | |
| Red Hat Enterprise Linux | =8.0 | |
| Red Hat Enterprise Linux | =9.0 | |
| Fedoraproject Fedora | =37 | |
| Debian Debian Linux | =11.0 | |
| Debian Debian Linux | =12.0 |
Remedy
As a possible workaround, disable Spotlight by removing all configuration stanzas ("spotlight=yes|true") that enable Spotlight .
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Reference Links
- https://access.redhat.com/security/cve/CVE-2023-34966
- https://www.samba.org/samba/security/CVE-2023-34966
- https://bugzilla.redhat.com/show_bug.cgi?id=2222793
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BPCSGND7LO467AJGR5DYBGZLTCGTOBCC/
- https://security.netapp.com/advisory/ntap-20230731-0010/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OT74M42E6C36W7PQVY3OS4ZM7DVYB64Z/
- https://www.debian.org/security/2023/dsa-5477
- https://launchpad.net/bugs/cve/CVE-2023-34966
- https://www.cve.org/CVERecord?id=CVE-2023-34966 https://nvd.nist.gov/vuln/detail/CVE-2023-34966 https://www.samba.org/samba/security/CVE-2023-34966
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-34966
- https://www.samba.org/samba/security/CVE-2023-34966.html
- https://ubuntu.com/security/notices/USN-6238-1
- https://nvd.nist.gov/vuln/detail/CVE-2023-34966
- https://security-tracker.debian.org/tracker/CVE-2023-34966
- https://ubuntu.com/security/CVE-2023-34966
- https://access.redhat.com/errata/RHSA-2023:6667
- https://access.redhat.com/errata/RHSA-2023:7139
- https://access.redhat.com/errata/RHSA-2024:0423
- https://access.redhat.com/errata/RHSA-2024:0580
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2224253
- https://access.redhat.com/errata/RHSA-2024:4101
Frequently Asked Questions
What is CVE-2023-34966?
CVE-2023-34966 is an infinite loop vulnerability found in Samba's mdssvc RPC service for Spotlight.
How severe is CVE-2023-34966?
CVE-2023-34966 has a severity level of high.
What software is affected by CVE-2023-34966?
Samba versions up to and including 4.18.5 are affected by CVE-2023-34966.
How can I fix CVE-2023-34966?
To fix CVE-2023-34966, update your Samba software to version 4.18.6 or higher.
Where can I find more information about CVE-2023-34966?
You can find more information about CVE-2023-34966 on the Red Hat Security Advisory, Samba website, and Bugzilla.
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