Synology Drive Client: Inclusion of Functionality from Untrusted Control Sphere
CVE-2022-49038 is a high-severity inclusion of functionality from untrusted control sphere vulnerability in Synology Drive Client from Synology, with a CVSS 3.1 base score of 7.8 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists version 3.5.0-16084 as the first without the flaw, so updating Synology Drive Client to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.2% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Synology Drive Client to 3.5.0-16084 or a later version.
- Update drive to 3.5.0-16084 or a later version.
- Update Drive Client to 3.3.0-15082 or a later version.
- Read the advisory on synology.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Synology | Synology Drive Client | before 3.5.0-16084 | 3.5.0-16084 |
| Synology | drive | before 3.5.0-16084 | 3.5.0-16084 |
| Synology | Drive Client | before 3.3.0-15082 | 3.3.0-15082 |
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
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- 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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.8 | High | CNA (synology.com) |
| CVSS 3.1 | 7.8 | High | NVD |
Official description
Inclusion of functionality from untrusted control sphere vulnerability in OpenSSL DLL component in Synology Drive Client before 3.3.0-15082 allows local users to execute arbitrary code via unspecified vectors.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Inclusion of Functionality from Untrusted Control Sphere
The product imports, requires, or includes executable functionality (such as a library) from a source that is outside of the intended control sphere.
How developers prevent this class of flaw
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
- When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs. For example, ID 1 could map to inbox.txt and ID 2 could map to profile.txt. Features such as the ESAPI AccessReferenceMap provide this capability.
- For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
More Inclusion of Functionality from Untrusted Control Sphere vulnerabilities (CWE-829)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in Synology Drive Client
- 8.2 High severity
Recent Inclusion of Functionality from Untrusted Control Sphere vulnerabilities
- 8.1 High severity
- 8.0 High severity
- 8.8 High severity
- 8.1 High severity
- 9.8 Critical severity
- 9.8 Critical severity
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