Analyst readout for executives and security teams
Plain-English summary
yubiserver versions before 0.6 have SQL injection flaws that may let an unauthenticated network attacker bypass authentication. For organizations relying on yubiserver in an access-control path, this is a critical identity risk. The public bundle does not show active exploitation.
Executive priority
Treat as urgent where yubiserver protects access to business systems. Prioritize inventory and upgrade because the stated impact is authentication bypass with critical CVSS characteristics. If yubiserver is not deployed, document non-exposure.
Technical view
The CVE describes CWE-89 SQL injection in yubiserver before 0.6. CVSS 3.1 is 9.8 with network access, low complexity, no privileges, no user interaction, and high confidentiality, integrity, and availability impact. The stated outcome is potential authentication bypass.
Likely exposure
Exposure appears limited to deployments running yubiserver before 0.6, especially if reachable over a network. The bundle does not identify downstream packages, specific configurations, or affected operating-system versions beyond the referenced Debian bug and upstream changelog.
Exploitation context
No KEV listing is present, and the provided sources do not claim active exploitation. The risk remains high because the vulnerability is remotely reachable, unauthenticated, low complexity, and tied to possible authentication bypass.
Researcher notes
Evidence is sparse. The bundle provides the affected range, CWE, CVSS vector, Debian bug, and upstream changelog, but not detailed vulnerable parameters or exploit status. Avoid assuming broader product impact without vendor or distribution confirmation.
Mitigation direction
- Identify any yubiserver deployments and record exact installed versions.
- Upgrade yubiserver to 0.6 or later where vendor guidance confirms the fix.
- If upgrade is delayed, restrict network access to trusted systems only.
- Review Debian bug 796495 and the upstream changelog for package-specific guidance.
- Monitor authentication logs for abnormal validation or bypass indicators.
Validation and detection
- Confirm whether yubiserver is present in production, staging, or legacy hosts.
- Verify installed yubiserver versions against the before-0.6 affected range.
- Check whether yubiserver endpoints are reachable from untrusted networks.
- Review authentication logs around yubiserver for unexplained successes or anomalies.
- Track remediation evidence in the vulnerability management record.
Public sources used
Based on public source material and reviewed before publication.
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-89: Database access and collection lookup
Injection into data stores can inform collection, data access, and exfiltration detection reviews. 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 lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupDatabase behavior lookup
The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2015-0842 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://bugs.debian.org/796495CVE reference
- http://www.include.gr/debian/yubiserver/#changelogCVE reference
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.
Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.