Security readout for executives and security teams
Plain-English summary
apport is Ubuntu crash reporting. A local logged-in attacker could abuse a timing race after a crash, reuse the crashed process ID, and execute code as root. This is not a remote internet-facing bug, but it is serious on shared Ubuntu systems or already-compromised endpoints because it can convert limited access into full host control.
Executive priority
Treat this as a high-priority local privilege-escalation patching issue, not an emergency internet-wide remote exploit. Patch affected Ubuntu systems in normal security-maintenance windows, faster for shared or high-value hosts where local compromise would create material business impact.
Technical view
CVE-2020-15702 is a CWE-367 TOCTOU flaw in Canonical apport. The race involves process identity checks and PID recycling after a crash. CVSS 3.1 is 7.0, with local attack vector, high complexity, low privileges required, no user interaction, unchanged scope, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to Ubuntu systems running affected apport packages: 2.20.1 before 2.20.1-0ubuntu2.24, 2.20.9 before 2.20.9-0ubuntu7.16, or 2.20.11 before 2.20.11-0ubuntu27.6. Risk is highest on multi-user servers, developer workstations, kiosks, and systems where an attacker may already have local code execution.
Exploitation context
The provided sources describe local privilege escalation and arbitrary code execution. The CVE is not listed as KEV in the supplied bundle, and no cited source in the bundle establishes active exploitation. The attack is rated high complexity because it depends on a race condition and PID reuse, but successful exploitation would grant root-level impact.
Researcher notes
Key mechanics are a TOCTOU race in apport around crashed-process handling and PID recycling. Evidence supports local privilege escalation with high impact but high attack complexity. The bundle names fixed package revisions but does not provide enough detail to validate exploitability safely without vendor advisories or controlled lab review.
Mitigation direction
- Upgrade apport to the fixed Ubuntu package for the installed release.
- Confirm Canonical guidance in USN-4449-1 and USN-4449-2 before operational rollout.
- Prioritize shared systems and endpoints where untrusted users can run local code.
- Review crash-reporting exposure where apport is installed or enabled.
- Use vendor-supported packages rather than unsupported manual apport builds.
Validation and detection
- Inventory Ubuntu hosts and installed apport package versions.
- Compare package versions against Canonical fixed versions in the advisory.
- Confirm local users cannot retain unnecessary shell or code-execution access.
- Review security telemetry for suspicious local privilege-escalation attempts.
- Document exceptions where affected hosts cannot be patched immediately.
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-367: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-15702 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 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:L/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:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H15.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7HighVector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- USN-4449-1CVE reference · x_refsource_CONFIRM, vendor-advisory
- https://www.zerodayinitiative.com/advisories/ZDI-20-979/CVE reference · x_refsource_MISC
- USN-4449-2CVE reference · vendor-advisory, x_refsource_UBUNTU
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.
Time-of-check Time-of-use (TOCTOU) Race Condition
Time-of-check Time-of-use (TOCTOU) Race Condition represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.