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CVE Record

CVE-2019-7306: Byobu apport hook uploads user's ~/.screenrc

Byobu Apport hook may disclose sensitive information since it automatically uploads the local user's .screenrc which may contain private hostnames, usernames and passwords. This issue affects: byobu

MediumCVSS 4.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

Byobu could include a user's .screenrc file in an Apport problem report. That file can contain private hostnames, usernames, or passwords, so the main business risk is accidental credential and infrastructure disclosure during crash reporting.

Executive priority

Treat this as a moderate data-exposure issue, not an emergency remote-code-execution event. Prioritize systems likely to submit crash reports and accounts where .screenrc may contain reusable credentials.

Technical view

CVE-2019-7306 affects Canonical byobu. Its Apport hook automatically uploads the local user's ~/.screenrc, creating a low-confidentiality information disclosure condition. The CVSS v3.1 score is 4.3, with user interaction required and no stated integrity or availability impact.

Likely exposure

Exposure is most likely on Ubuntu systems using byobu where Apport reports are generated or submitted, especially if ~/.screenrc contains secrets or private infrastructure details. The source bundle does not identify exact affected or fixed versions.

Exploitation context

The provided sources do not report active exploitation, and the CVE is not listed as KEV. This appears to be an accidental disclosure path tied to crash reporting rather than a direct remote compromise path.

Researcher notes

The source bundle confirms the disclosure mechanism and affected product but does not provide exact versions, patch identifiers, or exploit observations. Validation should focus on package status, Apport behavior, and whether sensitive .screenrc content was uploaded.

Mitigation direction

  • Check Canonical or Ubuntu guidance for fixed byobu packages.
  • Update byobu if a vendor-supported fix is available.
  • Remove passwords, tokens, and sensitive hostnames from ~/.screenrc.
  • Review Apport reports before submission for sensitive attachments.
  • Rotate credentials if ~/.screenrc was exposed in submitted reports.

Validation and detection

  • Inventory systems with byobu installed and Apport enabled.
  • Inspect ~/.screenrc files for credentials or sensitive infrastructure details.
  • Review submitted Apport or Launchpad reports for attached .screenrc content.
  • Confirm byobu package status against Canonical or Ubuntu guidance.
  • Verify exposed credentials have been rotated where needed.
Prepared
Confidence
medium
Sources
4

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-2019-7306 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
4.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

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
3Source 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
4.3CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N2.81.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

4.3Medium
CVSS 3.1 vector shape for CVE-2019-7306Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

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
CanonicalbyobuunspecifiedListed
Weakness

CWE details

No CWE listed

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