Security readout for executives and security teams
Plain-English summary
Open Build Service had a permission flaw that let any logged-in user change project sources through review handling, even without write access. For organizations using OBS to build or publish software, this is a supply-chain integrity risk because unauthorized source changes can affect packages and downstream releases.
Executive priority
Treat this as a high-priority remediation for any OBS environment used to build production software. The main business risk is unauthorized source modification in the build pipeline, which can undermine release integrity and trust.
Technical view
CVE-2018-7688 is a missing authorization check in Open Build Service review handling before 2.9.3. The CVSS 3.0 vector is AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L, reflecting authenticated network access, high integrity impact, and low availability impact.
Likely exposure
Exposure is likely limited to openSUSE Open Build Service deployments older than 2.9.3 where untrusted or broadly provisioned authenticated users can access review workflows.
Exploitation context
The provided sources do not show active exploitation, and the CVE is not marked as CISA KEV. The issue is still serious because exploitation requires only authenticated access and targets source integrity rather than data theft.
Researcher notes
This maps to CWE-862, missing authorization. The sources identify the vulnerable boundary as review handling and state versions before 2.9.3 are affected. They do not provide detailed affected subversion ranges, exploit sightings, or environment-specific mitigations beyond the upstream fix path.
Mitigation direction
- Upgrade Open Build Service to version 2.9.3 or later.
- Review the referenced upstream commit and SUSE guidance for backport requirements.
- Restrict authenticated user access until vulnerable instances are upgraded.
- Audit project source changes made through review workflows before remediation.
- Check vendor guidance if using downstream packages or custom OBS builds.
Validation and detection
- Inventory all Open Build Service instances and record their exact versions.
- Confirm no production instance runs an OBS version earlier than 2.9.3.
- Review project histories for source changes by users lacking write permission.
- Verify review-handling authorization tests exist in the deployed codebase.
- Confirm package maintainers have reviewed suspicious source modifications.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-862: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2018-7688 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.1 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
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.
CVSS vector scores
1 official scoreWe 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.
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L2.84.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.1HighVector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/openSUSE/open-build-service/commit/b15cf19e9e01115f653c76ffdc8f54cd97566553CVE reference · x_refsource_CONFIRM
- https://bugzilla.suse.com/show_bug.cgi?id=CVE-2018-7688CVE reference · x_refsource_CONFIRM
- [opensuse-buildservice] 20180606 Open Build Service 2.9.3 releasedCVE reference · mailing-list, x_refsource_MLIST
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Missing Authorization
Missing Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.