Unified Controller (DSMUC): Off-by-one Error
CVE-2024-10442 is a critical-severity off-by-one error vulnerability in Unified Controller (DSMUC) from Synology, with a CVSS 3.1 base score of 10.0 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version 3.1.4-23079 as the first without the flaw, so updating Unified Controller (DSMUC) to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.45% chance of exploitation within 30 days, higher than 74% of scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update Unified Controller (DSMUC) to 3.1.4-23079 or a later version.
- Update Replication Service to 1.2.2-0353 or 1.0.12-0066 or 1.3.0-0423, whichever matches your release line, or a later version.
- Update Unified Controller to 3.1.4-23079 or a later version.
- Read the advisory on synology.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Synology | Unified Controller (DSMUC) | 3.1 up to, but not including, 3.1.4-23079 | 3.1.4-23079 |
| Synology | Replication Service | before 1.2.2-0353; before 1.0.12-0066; before 1.3.0-0423 | 1.2.2-0353, 1.0.12-0066, 1.3.0-0423 |
| Synology | Unified Controller | before 3.1.4-23079 | 3.1.4-23079 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- ChangedThe attack can reach beyond the vulnerable component into other systems.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H. Scored by CNA (synology.com).
Official description
Off-by-one error vulnerability in the transmission component in Synology Replication Service before 1.0.12-0066, 1.2.2-0353 and 1.3.0-0423 and Synology Unified Controller (DSMUC) before 3.1.4-23079 allows remote attackers to execute arbitrary code, potentially leading to a broader impact across the system via unspecified vectors.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Off-by-one Error
A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value.
How developers prevent this class of flaw
- When copying character arrays or using character manipulation methods, the correct size parameter must be used to account for the null terminator that needs to be added at the end of the array. Some examples of functions susceptible to this weakness in C include strcpy(), strncpy(), strcat(), strncat(), printf(), sprintf(), scanf() and sscanf().
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in Unified Controller (DSMUC)
- 8.8 High severity
- 7.5 High severity
- 9.6 Critical severity
- 8.1 High severity
Recent Off-by-one Error vulnerabilities
- 7.8 High severity
- 7.5 High severity
- 7.1 High severity
- 9.8 Critical severity
- 7.8 High severity
- 7.1 High severity
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