Security readout for executives and security teams
Plain-English summary
This is a local Ubuntu issue in apport, Canonical's crash reporting tooling. A helper function could follow attacker-controlled symlinks or open FIFOs when used by OpenJDK 8 apport hooks, potentially exposing private data from crash collection to another local user. It matters most on shared systems where untrusted users can log in.
Executive priority
Treat as a high-priority local privilege boundary issue for shared Ubuntu environments. It is not evidenced as internet-exploited, but it can expose private data between users, which is material for multi-user servers, developer systems, and regulated workloads.
Technical view
CVE-2021-32548 affects apport hookutils.py read_file(). The function followed symbolic links or opened FIFOs, mapped to CWE-59 and CWE-61. In the OpenJDK 8 apport hook path, this could cross user boundaries and disclose sensitive data. CVSS 3.1 is 7.3: local access, low complexity, low privileges, no user interaction, changed scope.
Likely exposure
Exposure is mainly Ubuntu systems using affected apport versions, especially where OpenJDK 8 apport hooks are present and multiple local users exist. Single-user desktops are lower business risk than shared servers, developer workstations, labs, or bastion-like systems with untrusted local accounts.
Exploitation context
The source bundle does not indicate CISA KEV listing or active exploitation. The weakness requires local access with low privileges. The impact described is private data exposure to other local users, with some availability impact; remote exploitation is not supported by the cited sources.
Researcher notes
The available evidence names apport read_file() behavior and OpenJDK 8 apport hooks but does not provide fixed version details in the bundle. Avoid assuming broader product impact. Focus validation on affected Canonical apport packages, local-user threat models, symlink/FIFO handling, and vendor-confirmed package fixes.
Mitigation direction
- Check Canonical guidance and Launchpad bug status for fixed apport packages.
- Update affected Ubuntu systems through supported package channels.
- Prioritize shared systems with local users and OpenJDK 8 installed.
- Reduce unnecessary local accounts on systems where apport is present.
- Review whether apport crash collection is required on sensitive shared hosts.
Validation and detection
- Inventory Ubuntu hosts running apport and OpenJDK 8 packages.
- Compare installed apport versions against Canonical advisory or package metadata.
- Confirm vulnerability scanner findings reference CVE-2021-32548, not only generic symlink issues.
- Review shared-user systems for sensitive crash-reporting data exposure risk.
- Verify remediation after package update with package version and scanner rescan.
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-59: 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 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-2021-32548 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.