GNU screen logfile_reopen privilege dropping

CVSS Meta Temp Score
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CTI Interest Score
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7.4$0-$5k0.00

Summaryinfo

A vulnerability was found in GNU screen. It has been rated as critical. This impacts the function logfile_reopen. Performing a manipulation results in Local Privilege Escalation. This vulnerability is cataloged as CVE-2025-23395. The attack must be initiated from a local position. There is no exploit available.

Detailsinfo

A vulnerability classified as critical has been found in GNU screen (version unknown). This affects the function logfile_reopen. The manipulation with an unknown input leads to a local privilege escalation vulnerability. CWE is classifying the issue as CWE-271. The product does not drop privileges before passing control of a resource to an actor that does not have those privileges. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Screen 5.0.0 when it runs with setuid-root privileges does not drop privileges while operating on a user supplied path. This allows unprivileged users to create files in arbitrary locations with `root` ownership, the invoking user's (real) group ownership and file mode 0644. All data written to the Screen PTY will be logged into this file, allowing to escalate to root privileges

The advisory is shared at bugzilla.redhat.com. This vulnerability is uniquely identified as CVE-2025-23395 since 01/15/2025. The exploitability is told to be difficult. An attack has to be approached locally. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

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License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔍
CNA CVSS-BT Score: 🔍
CNA Vector: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.4

VulDB Base Score: 7.0
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 7.8
CNA Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Privilege dropping
CWE: CWE-271 / CWE-270 / CWE-266
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: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/15/2025 🔍
05/14/2025 +118 days 🔍
05/14/2025 +0 days 🔍
05/26/2025 +12 days 🔍

Sourcesinfo

Vendor: gnu.org

Advisory: bugzilla.redhat.com
Status: Confirmed

CVE: CVE-2025-23395 (🔍)
GCVE (CVE): GCVE-0-2025-23395
GCVE (VulDB): GCVE-100-308889

Entryinfo

Created: 05/14/2025 08:43
Updated: 05/26/2025 18:37
Changes: 05/14/2025 08:43 (48), 05/26/2025 18:37 (25)
Complete: 🔍
Cache ID: 216::103

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