Samba: infinite loop in mdssvc rpc service for spotlight
Priority HIGH 68CWE-835Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 18 fixed, 3 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-835.
Summary
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.
Why it matters now
EPSS 0.62295 99th percentileScored 2026-11-07
Fix Partial Red Hat: 5 advisoriesRed Hat: 18 fixed, 3 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 8 | — | 4.18.6-1.el8 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8 | — | 4.18.6-1.el8 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support | — | 4.15.5-15.el8_6 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 8.8 Extended Update Support | — | 4.17.5-5.el8_8 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9 | — | 4.18.6-100.el9 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9 | — | 4.18.6-100.el9 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9.2 Extended Update Support | — | 4.17.5-105.el9_2 | Patch available | CNA |
| Red Hat | Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 | — | 4.15.5-15.el8_6 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 6 | — | — | No fix listed | CNA |
| Red Hat | Red Hat Enterprise Linux 6 | — | — | No fix listed | CNA |
| Red Hat | Red Hat Enterprise Linux 7 | — | — | No fix listed | CNA |
| Red Hat | Red Hat Storage 3 | — | — | No fix listed | CNA |
- Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in 4.18.6-1.el8 Patch available CNA
- Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in 4.18.6-1.el8 Patch available CNA
- Red Hat Enterprise Linux 8.6 Extended Update Support VendorRed Hat Affected — Fixed in 4.15.5-15.el8_6 Patch available CNA
- Red Hat Enterprise Linux 8.8 Extended Update Support VendorRed Hat Affected — Fixed in 4.17.5-5.el8_8 Patch available CNA
- Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 4.18.6-100.el9 Patch available CNA
- Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 4.18.6-100.el9 Patch available CNA
- Red Hat Enterprise Linux 9.2 Extended Update Support VendorRed Hat Affected — Fixed in 4.17.5-105.el9_2 Patch available CNA
- Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in 4.15.5-15.el8_6 Patch available CNA
- Red Hat Enterprise Linux 6 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat Enterprise Linux 6 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat Storage 3 VendorRed Hat Affected — Fixed in — No fix listed CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* | before 4.16.11; 4.17.0 to before 4.17.10; 4.18.0 to before 4.18.5 | Vulnerable | Samba |
| cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* | 37 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:* | 38 | Vulnerable | Fedoraproject |
| cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* | 8.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Red Hat |
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | 11.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:* | 12.0 | Vulnerable | Debian |
- cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* Versions before 4.16.11; 4.17.0 to before 4.17.10; 4.18.0 to before 4.18.5 Vulnerable ·Samba
- cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* Versions 37 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:* Versions 38 Vulnerable ·Fedoraproject
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Red Hat
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:* Versions 12.0 Vulnerable ·Debian
Remediation
Red Hat 5 advisories
- RHSA-2024:4101 Released 2024-06-25 · Red Hat rating Moderatesamba security update
- Red Hat CodeReady Linux Builder EUS (v.9.2) libnetapi-devel-4.17.5-105.el9_2, libsmbclient-devel-4.17.5-105.el9_2, libwbclient-devel-4.17.5-105.el9_2 +6
- Red Hat Enterprise Linux AppStream EUS (v.9.2) samba-client-4.17.5-105.el9_2, samba-krb5-printing-4.17.5-105.el9_2, samba-vfs-iouring-4.17.5-105.el9_2 +3
- Red Hat Enterprise Linux BaseOS EUS (v.9.2) libnetapi-4.17.5-105.el9_2, libsmbclient-4.17.5-105.el9_2, libwbclient-4.17.5-105.el9_2 +15
- Red Hat Enterprise Linux Resilient Storage EUS (v.9.2) ctdb-4.17.5-105.el9_2
- RHSA-2024:0580 Released 2024-01-30 · Red Hat rating Moderatesamba security update
- Red Hat CodeReady Linux Builder EUS (v.8.8) libnetapi-devel-4.17.5-5.el8_8, libsmbclient-devel-4.17.5-5.el8_8, libwbclient-devel-4.17.5-5.el8_8 +2
- Red Hat Enterprise Linux AppStream EUS (v.8.8) samba-vfs-iouring-4.17.5-5.el8_8
- Red Hat Enterprise Linux BaseOS EUS (v.8.8) ctdb-4.17.5-5.el8_8, libnetapi-4.17.5-5.el8_8, libsmbclient-4.17.5-5.el8_8 +25
- RHSA-2024:0423 Released 2024-01-25 · Red Hat rating Moderatesamba security update
- Red Hat CodeReady Linux Builder EUS (v.8.6) libsmbclient-devel-4.15.5-15.el8_6, libwbclient-devel-4.15.5-15.el8_6, samba-devel-4.15.5-15.el8_6
- Red Hat Enterprise Linux AppStream EUS (v.8.6) samba-vfs-iouring-4.15.5-15.el8_6
- Red Hat Enterprise Linux BaseOS EUS (v.8.6) ctdb-4.15.5-15.el8_6, libsmbclient-4.15.5-15.el8_6, libwbclient-4.15.5-15.el8_6 +18
- Red Hat Virtualization 4 Hypervisor for RHEL 8 libsmbclient-4.15.5-15.el8_6, libwbclient-4.15.5-15.el8_6, samba-4.15.5-15.el8_6 +3
Show 2 more Red Hat advisories
- RHSA-2023:7139 Released 2023-11-14 · Red Hat rating Moderatesamba security, bug fix, and enhancement update
- Red Hat CodeReady Linux Builder (v. 8) libnetapi-devel-4.18.6-1.el8, libsmbclient-devel-4.18.6-1.el8, libwbclient-devel-4.18.6-1.el8 +2
- Red Hat Enterprise Linux AppStream (v. 8) samba-vfs-iouring-4.18.6-1.el8
- Red Hat Enterprise Linux BaseOS (v. 8) ctdb-4.18.6-1.el8, libnetapi-4.18.6-1.el8, libsmbclient-4.18.6-1.el8 +25
- RHSA-2023:6667 Released 2023-11-07 · Red Hat rating Moderatesamba security, bug fix, and enhancement update
- Red Hat CodeReady Linux Builder (v. 9) libnetapi-devel-4.18.6-100.el9, libsmbclient-devel-4.18.6-100.el9, libwbclient-devel-4.18.6-100.el9 +6
- Red Hat Enterprise Linux AppStream (v. 9) samba-client-4.18.6-100.el9, samba-krb5-printing-4.18.6-100.el9, samba-vfs-iouring-4.18.6-100.el9 +3
- Red Hat Enterprise Linux BaseOS (v. 9) libnetapi-4.18.6-100.el9, libsmbclient-4.18.6-100.el9, libwbclient-4.18.6-100.el9 +15
- Red Hat Enterprise Linux Resilient Storage (v. 9) ctdb-4.18.6-100.el9
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 and 6 more products — RHSA-2023:6667
4 records Highest priority Priority HIGH 1 HIGH, 1 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2023-17457 Samba: type confusion in mdssvc rpc service for spotlightPriority MEDIUM 59
- TI-2022-01968 Samba: out-of-bounds read in winbind auth_crapPriority LOW 30
- TI-2023-17458 Samba: spotlight server-side share path disclosurePriority LOW 27
- Advisory ·
Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 and 6 more products — RHSA-2023:7139
4 records Highest priority Priority HIGH 1 HIGH, 1 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2023-17457 Samba: type confusion in mdssvc rpc service for spotlightPriority MEDIUM 59
- TI-2022-01968 Samba: out-of-bounds read in winbind auth_crapPriority LOW 30
- TI-2023-17458 Samba: spotlight server-side share path disclosurePriority LOW 27
Show 2 more groups
- Advisory ·
Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 and 6 more products — RHSA-2024:0423
4 records Highest priority Priority HIGH 1 HIGH, 1 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2023-17457 Samba: type confusion in mdssvc rpc service for spotlightPriority MEDIUM 59
- TI-2022-01968 Samba: out-of-bounds read in winbind auth_crapPriority LOW 30
- TI-2023-17458 Samba: spotlight server-side share path disclosurePriority LOW 27
- Advisory ·
Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 and 6 more products — RHSA-2024:0580
4 records Highest priority Priority HIGH 1 HIGH, 1 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2023-17457 Samba: type confusion in mdssvc rpc service for spotlightPriority MEDIUM 59
- TI-2022-01968 Samba: out-of-bounds read in winbind auth_crapPriority LOW 30
- TI-2023-17458 Samba: spotlight server-side share path disclosurePriority LOW 27
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Storage 3 | Affected | No fix planned: Out of support scope |
| Red Hat CodeReady Linux Builder (v. 8) | Fixed | RHSA-2023:7139 |
| Red Hat CodeReady Linux Builder (v. 9) | Fixed | RHSA-2023:6667 |
| Red Hat CodeReady Linux Builder EUS (v.8.6) | Fixed | RHSA-2024:0423 |
| Red Hat CodeReady Linux Builder EUS (v.8.8) | Fixed | RHSA-2024:0580 |
| Red Hat CodeReady Linux Builder EUS (v.9.2) | Fixed | RHSA-2024:4101 |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2023:7139 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2023:6667 |
| Red Hat Enterprise Linux AppStream EUS (v.8.6) | Fixed | RHSA-2024:0423 |
| Red Hat Enterprise Linux AppStream EUS (v.8.8) | Fixed | RHSA-2024:0580 |
| Red Hat Enterprise Linux AppStream EUS (v.9.2) | Fixed | RHSA-2024:4101 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2023:7139 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2023:6667 |
| Red Hat Enterprise Linux BaseOS EUS (v.8.6) | Fixed | RHSA-2024:0423 |
| Red Hat Enterprise Linux BaseOS EUS (v.8.8) | Fixed | RHSA-2024:0580 |
| Red Hat Enterprise Linux BaseOS EUS (v.9.2) | Fixed | RHSA-2024:4101 |
| Red Hat Enterprise Linux Resilient Storage (v. 9) | Fixed | RHSA-2023:6667 |
| Red Hat Enterprise Linux Resilient Storage EUS (v.9.2) | Fixed | RHSA-2024:4101 |
| Red Hat Virtualization 4 Hypervisor for RHEL 8 | Fixed | RHSA-2024:0423 |
Not affected: 2 products
- Red Hat Enterprise Linux AppStream (v. 8)
- Red Hat Enterprise Linux AppStream (v. 9)
Timeline
- 2026-10-02 Threatist record created from CVE-2023-34966
- 2026-10-03 Alias added: GHSA-45c7-642q-qm9m
References
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Sources
- CVE-2023-34966 · CVE Program
- CVE-2023-34966 · NVD
- FIRST EPSS
- GHSA-45c7-642q-qm9m · GitHub Advisory Database · CC BY 4.0
- CVE-2023-34966 · Red Hat security data · CC BY 4.0
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