Security readout for executives and security teams
Plain-English summary
On affected Ubuntu systems, apport's file-reading helper could follow attacker-controlled links or special files when openjdk-15 crash hooks use it. A local user could cause private data to be exposed to other local users. This is mainly a shared-system and workstation/server hardening issue, not a remote internet-exposed flaw.
Executive priority
Treat this as a high-priority local information disclosure issue for shared Ubuntu systems. It is not described as remotely exploitable, but it can expose private data across local user boundaries and should be remediated through vendor-supported updates.
Technical view
The issue is in apport/hookutils.py read_file(), which followed symbolic links or opened FIFOs. When invoked through openjdk-15 apport hooks, that behavior could cross intended file boundaries and leak sensitive data. CVSS 3.1 is 7.3 with local attack vector, low complexity, low privileges, no user interaction, changed scope, high confidentiality impact, and low availability impact.
Likely exposure
Exposure is likely limited to Ubuntu systems using affected Canonical apport packages where openjdk-15 apport hooks are present. Risk is higher on shared Linux hosts, developer workstations, build systems, or environments with untrusted local users.
Exploitation context
The provided sources do not show active exploitation, and the CVE is not marked as CISA KEV. Exploitation requires local low-privileged access, but no victim interaction is required once the vulnerable path is reachable.
Researcher notes
The evidence points to unsafe link and FIFO handling in apport's read_file() helper when used by openjdk-15 hooks. The supplied bundle does not name fixed versions, exploit availability, or detailed remediation beyond the Launchpad reference, so validation should stay tied to Canonical package guidance.
Mitigation direction
- Check Canonical or Ubuntu guidance for fixed apport package versions.
- Apply supported Ubuntu security updates for apport and related openjdk-15 hooks.
- Prioritize shared systems with multiple local users or untrusted accounts.
- Restrict unnecessary local user access on affected hosts.
- Monitor vendor advisories for any named workaround or fixed version details.
Validation and detection
- Inventory Ubuntu hosts with apport installed.
- Identify systems with openjdk-15 apport hooks present.
- Compare installed apport versions against Canonical guidance for CVE-2021-32551.
- Confirm affected package versions are upgraded or otherwise addressed.
- Review shared-user hosts first because the attack vector is local.
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-2021-32551 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.