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CVE Record

CVE-2018-3878: Multiple exploitable buffer overflow vulnerabilities exist in the credentials handler of video-core's HTTP...

Multiple exploitable buffer overflow vulnerabilities exist in the credentials handler of video-core's HTTP server of Samsung SmartThings Hub STH-ETH-250 devices with firmware version 0.20.17. The video-core process incorrectly extracts fields from a user-controlled JSON payload, leading to a buffer overflow on the stack. A strncpy overflows the destination buffer, which has a size of 16 bytes. An attacker can send an arbitrarily long "region" value in order to exploit this vulnerability.

CriticalCVSS 9.9Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

This flaw affects a specific Samsung SmartThings Hub model and firmware. A logged-in network attacker could abuse how the hub handles a JSON credentials field, potentially taking control of the vulnerable process. The business concern is highest where legacy hubs remain reachable on internal or exposed networks.

Executive priority

Prioritize remediation for any confirmed STH-ETH-250 hub on firmware 0.20.17, especially if reachable beyond a tightly controlled network. If affected devices exist, reduce access immediately while confirming vendor update or replacement options.

Technical view

CVE-2018-3878 is a stack buffer overflow in the video-core HTTP server credentials handler on Samsung SmartThings Hub STH-ETH-250 firmware 0.20.17. The vulnerable code copies an attacker-controlled JSON region value into a 16-byte stack buffer. CVSS 3.0 is 9.9, with network access, low privileges, no user interaction, changed scope, and high CIA impact.

Likely exposure

Exposure appears limited to Samsung SmartThings Hub STH-ETH-250 devices running firmware 0.20.17. The sources do not name other products or firmware versions. Risk is most relevant where a low-privileged user or compromised account can reach the hub’s HTTP service over the network.

Exploitation context

The provided sources describe the issue as exploitable and network-reachable with low privileges required. The CVE is not marked as CISA KEV, and the bundle provides no evidence of active exploitation in the wild. Treat exploit status as unconfirmed from the supplied evidence.

Researcher notes

The key condition is the vulnerable firmware and reachable video-core HTTP credentials handler. Sources identify an oversized JSON region value causing stack overflow, but do not provide patch details, affected-version ranges beyond 0.20.17, KEV status, or confirmed exploitation telemetry.

Mitigation direction

  • Inventory Samsung SmartThings Hub STH-ETH-250 devices and firmware versions.
  • Check Samsung or SmartThings vendor guidance for firmware updates or replacement advice.
  • Restrict hub HTTP access to trusted management networks only.
  • Remove any direct internet exposure to affected hubs.
  • Segment IoT hubs from corporate and sensitive networks.
  • Review hub account access and remove unnecessary low-privilege users.

Validation and detection

  • Confirm whether any STH-ETH-250 hub runs firmware 0.20.17.
  • Verify network controls limit HTTP access to trusted hosts.
  • Check external attack-surface records for exposed SmartThings hubs.
  • Review internal logs for unusual hub HTTP requests or crashes.
  • Confirm update, replacement, or compensating-control status in asset records.
Prepared
Confidence
high
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2018-3878 mapping review

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Vulnerability profileCVE Program record
Severity
Critical
CVSS
9.9 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
9.9CVSS 3.0CriticalCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H3.16Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

9.9Critical
CVSS 3.0 vector shape for CVE-2018-3878Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
SamsungSmartThings Hub STH-ETH-250Firmware version 0.20.17Listed
Weakness

CWE details

No CWE listed

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