Apport on Ubuntu /var/lock/apport temp file

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability was found in Apport on Ubuntu. It has been classified as problematic. The impacted element is an unknown function of the file /var/lock/apport. The manipulation leads to temp file. This vulnerability is documented as CVE-2020-8831. The attack needs to be performed locally. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Apport on Ubuntu. This issue affects an unknown code block of the file /var/lock/apport. The manipulation with an unknown input leads to a temp file vulnerability. Using CWE to declare the problem leads to CWE-379. The product creates a temporary file in a directory whose permissions allow unintended actors to determine the file's existence or otherwise access that file. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Apport creates a world writable lock file with root ownership in the world writable /var/lock/apport directory. If the apport/ directory does not exist (this is not uncommon as /var/lock is a tmpfs), it will create the directory, otherwise it will simply continue execution using the existing directory. This allows for a symlink attack if an attacker were to create a symlink at /var/lock/apport, changing apport's lock file location. This file could then be used to escalate privileges, for example. Fixed in versions 2.20.1-0ubuntu2.23, 2.20.9-0ubuntu7.14, 2.20.11-0ubuntu8.8 and 2.20.11-0ubuntu22.

The weakness was released 04/22/2020 (Website). It is possible to read the advisory at launchpad.net. The identification of this vulnerability is CVE-2020-8831 since 02/10/2020. Attacking locally is a requirement. The requirement for exploitation is a simple authentication. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 2.20.1-0ubuntu2.23, 2.20.9-0ubuntu7.14, 2.20.11-0ubuntu8.8 or 2.20.11-0ubuntu22 eliminates this vulnerability.

Entry connected to this vulnerability is available at VDB-154272. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CNA Base Score: 6.5
CNA Vector (Canonical Ltd.): 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Temp file
CWE: CWE-379 / CWE-377
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Apport 2.20.1-0ubuntu2.23/2.20.9-0ubuntu7.14/2.20.11-0ubuntu8.8/2.20.11-0ubuntu22

Timelineinfo

02/10/2020 🔍
04/22/2020 +72 days 🔍
04/23/2020 +1 days 🔍
06/02/2024 +1501 days 🔍

Sourcesinfo

Advisory: USN-4315-2
Status: Not defined
Confirmation: 🔍

CVE: CVE-2020-8831 (🔍)
GCVE (CVE): GCVE-0-2020-8831
GCVE (VulDB): GCVE-100-154271
See also: 🔍

Entryinfo

Created: 04/23/2020 11:51
Updated: 06/02/2024 08:46
Changes: 04/23/2020 11:51 (39), 04/23/2020 11:56 (11), 10/11/2020 19:20 (1), 10/11/2020 19:31 (1), 06/02/2024 08:41 (17), 06/02/2024 08:46 (17)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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