Security readout for executives and security teams
Plain-English summary
This flaw can let a local Ubuntu user abuse apport crash-hook file reading behavior to expose private data when openjdk-17 apport hooks use the vulnerable function. It is not a remote takeover, but it matters on shared systems because confidentiality impact is high.
Executive priority
Treat as high priority for shared Ubuntu environments because local users may gain access to private data. It is lower urgency for single-user or tightly controlled hosts, and there is no provided evidence of active exploitation.
Technical view
CVE-2021-32553 affects Canonical apport. The read_file() function in apport/hookutils.py could follow malicious symbolic links or open FIFOs. In the openjdk-17 apport hook context, this could disclose private data to other local users. CVSS 3.1 is 7.3 with local access and low privileges required.
Likely exposure
Exposure is most likely on Ubuntu systems running affected apport versions listed in the CVE source bundle, especially where openjdk-17 apport hooks are installed and local users can interact with crash-reporting behavior. Internet-facing exposure is not indicated by the provided sources.
Exploitation context
The provided sources do not show active exploitation, and the CVE is not marked KEV. Exploitation requires local low-privileged access and abuses filesystem object handling in apport hook file reads. No exploit status beyond the vulnerability description is supported here.
Researcher notes
Key uncertainty is remediation detail: the source bundle names the vulnerable behavior and affected versions but does not provide fixed versions or a vendor mitigation. Analysis should stay focused on apport hook file handling, symbolic links, FIFOs, and openjdk-17 hook usage.
Mitigation direction
- Check Canonical or Launchpad guidance for fixed apport package availability.
- Update affected apport packages through supported Ubuntu repositories when fixes are available.
- Review whether openjdk-17 apport hooks are present on shared systems.
- Limit untrusted local user access on systems until remediation is confirmed.
- Consider reducing apport crash collection exposure where operationally acceptable.
Validation and detection
- Inventory Ubuntu hosts for the affected apport versions listed in the CVE bundle.
- Identify hosts with openjdk-17 apport hooks installed or enabled.
- Confirm remediation status against Canonical package guidance, not version assumptions.
- Prioritize validation on shared servers, developer workstations, and jump hosts.
- Document whether apport crash reporting is enabled on affected systems.
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
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CWE-59: Exact CWE lookup
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Open ATT&CK lookupCWE-61: 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 lookupCVE-2021-32553 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 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/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:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:L24.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.3HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1917904CVE reference · x_refsource_MISC
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 Link Resolution Before File Access ('Link Following')
Improper Link Resolution Before File Access ('Link Following') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
UNIX Symbolic Link (Symlink) Following
UNIX Symbolic Link (Symlink) Following represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.