Security readout for executives and security teams
Plain-English summary
A flaw in Ubuntu’s apport crash-reporting tooling could let a logged-in local user cause private data to be exposed through crash hook processing. The issue is local, not remotely reachable, but it matters on shared Linux systems because confidentiality impact is rated high.
Executive priority
Treat this as a high-priority Linux endpoint and shared-system issue, not an internet-wide emergency. Patch or mitigate first where many users share Ubuntu systems or where sensitive local data may be processed.
Technical view
CVE-2021-32555 affects Canonical apport hookutils.py read_file(), which could follow malicious symbolic links or open FIFOs. When used by xorg-hwe-18.04 apport hooks, this could expose private data to other local users. CVSS 3.1 is 7.3 with local access, low complexity, low privileges, changed scope, high confidentiality impact, and low availability impact.
Likely exposure
Exposure is most likely on Ubuntu systems running affected apport versions, especially where xorg-hwe-18.04 apport hooks are installed and local users have shell or account access.
Exploitation context
The source bundle supports local exploitation conditions only: a low-privileged local user, no user interaction, and no remote attack vector. CISA KEV is false, and the provided sources do not claim active exploitation.
Researcher notes
The key bug class is unsafe link or FIFO handling in a file-reading helper used by apport hooks. The bundle names affected versions and impact, but does not provide fixed versions, exploit artifacts, or detailed vendor mitigation text.
Mitigation direction
- Check Canonical or Ubuntu guidance for fixed apport packages before choosing remediation.
- Update affected Ubuntu systems from supported vendor repositories when a fixed package is available.
- Prioritize shared workstations, jump hosts, lab systems, and multi-user servers.
- Reduce unnecessary local user access on systems where affected apport hooks exist.
- Review crash-reporting configuration if temporary risk reduction is needed.
Validation and detection
- Inventory installed apport package versions against the affected versions in the CVE bundle.
- Check whether xorg-hwe-18.04 apport hooks are present on candidate systems.
- Confirm remediation status using Canonical package metadata or vendor advisory guidance.
- Review local user populations on exposed systems to assess practical risk.
- Document any compensating controls where immediate patching is unavailable.
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-2021-32555 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.