CVE-2021-3709 | Apport file permission bypass through emacs byte compilation errors

Exp

Function check_attachment_for_errors() in file data/general-hooks/ubuntu.py could be tricked into exposing private data via a constructed crash file. This issue affects: apport 2.14.1 versions prior to 2.14.1-0ubuntu3.29+esm8; 2.20.1 versions prior to 2.20.1-0ubuntu2.30+esm2; 2.20.9 versions prior to 2.20.9-0ubuntu7.26; 2.20.11 versions prior to 2.20.11-0ubuntu27.20; 2.20.11 versions prior to 2.20.11-0ubuntu65.3;

Published: 2021-10-01 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-3709 is rated Exploit Available (50.1/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.06%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2021-3709

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-3709

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2023-04-23 0.04% 0.06% +0.02%
2 2023-03-07 0.95% 0.04% -0.90%
3 2022-04-01 — 0.95% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-3709

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.0 4.0 [email protected]
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 1.8 3.6 [email protected]
2.1 2.0 LOW
AV:L/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 3.9 2.9 [email protected]

Weakness enumeration for CVE-2021-3709

OS Trackers for CVE-2021-3709

vendor priority summary link
ubuntu medium CVE-2021-3709 medium priority: Ubuntu including 1 source packages (apport), 8 status rows across 8 suites (bionic, focal, hirsute, impish, jammy, trusty, upstream, xenial): released 7, needs-triage 1. https://ubuntu.com/security/CVE-2021-3709

Affected software / configurations for CVE-2021-3709

Vendor Product Version Raw CPE
canonical apport 2.14.1-0ubuntu1 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu1:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu2 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu2:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.1 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.1:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.2 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.2:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.3 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.3:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.4 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.4:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.5 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.5:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.6 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.6:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.7 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.7:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.8 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.8:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.9 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.9:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.10 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.10:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.11 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.11:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.12 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.12:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.13 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.13:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.14 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.14:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.15 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.15:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.16 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.16:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.17 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.17:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.18 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.18:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.19 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.19:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.20 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.20:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.21 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.21:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.23 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.23:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.24 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.24:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.25 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.25:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.27 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.27:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.28 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.28:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.29 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.29:*:*:*:*:*:*:*
canonical apport 2.14.1-0ubuntu3.29\+esm7 cpe:2.3:a:canonical:apport:2.14.1-0ubuntu3.29\+esm7:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu1 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu1:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.1 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.1:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.2 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.2:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.4 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.4:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.5 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.5:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.6 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.6:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.7 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.7:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.8 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.8:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.9 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.9:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.10 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.10:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.12 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.12:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.13 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.13:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.14 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.14:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.15 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.15:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.16 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.16:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.17 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.17:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.18 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.18:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.19 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.19:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.20 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.20:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.21 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.21:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.22 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.22:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.23 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.23:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.25 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.25:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.26 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.26:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.27 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.27:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.28 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.28:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.30 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.30:*:*:*:*:*:*:*
canonical apport 2.20.1-0ubuntu2.30\+esm1 cpe:2.3:a:canonical:apport:2.20.1-0ubuntu2.30\+esm1:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu1 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu1:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu2 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu2:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu3 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu3:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu4 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu4:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu5 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu5:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu6 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu6:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.1 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.1:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.2 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.2:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.3 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.3:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.4 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.4:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.5 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.5:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.6 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.6:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.7 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.7:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.8 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.8:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.9 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.9:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.10 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.10:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.11 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.11:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.12 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.12:*:*:*:*:*:*:*
canonical apport 2.20.9-0ubuntu7.13 cpe:2.3:a:canonical:apport:2.20.9-0ubuntu7.13:*:*:*:*:*:*:*

References for CVE-2021-3709

cvelogic Threat Intelligence