CVE-2025-2173

libzvbi conv.c vbi_strndup_iconv_ucs2 uninitialized pointer

Severity Score

6.9

*CVSS v4

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

A vulnerability was found in libzvbi up to 0.2.43. It has been classified as problematic. Affected is the function vbi_strndup_iconv_ucs2 of the file src/conv.c. The manipulation of the argument src_length leads to uninitialized pointer. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 0.2.44 is able to address this issue. The patch is identified as 8def647eea27f7fd7ad33ff79c2d6d3e39948dce. It is recommended to upgrade the affected component. The code maintainer was informed beforehand about the issues. She reacted very fast and highly professional.

Es wurde eine problematische Schwachstelle in libzvbi bis 0.2.43 ausgemacht. Es geht dabei um die Funktion vbi_strndup_iconv_ucs2 der Datei src/conv.c. Mit der Manipulation des Arguments src_length mit unbekannten Daten kann eine uninitialized pointer-Schwachstelle ausgenutzt werden. Der Angriff kann über das Netzwerk passieren. Der Exploit steht zur öffentlichen Verfügung. Ein Aktualisieren auf die Version 0.2.44 vermag dieses Problem zu lösen. Der Patch wird als 8def647eea27f7fd7ad33ff79c2d6d3e39948dce bezeichnet. Als bestmögliche Massnahme wird das Einspielen eines Upgrades empfohlen.

This update for zvbi fixes the following issues. Fixed check on src_length to avoid an uninitialized heap read. Fixed integer overflow leading to heap overflow in src/conv.c, src/io-sim.c, src/search.c. Fixed integer overflow in _vbi_strndup_iconv. Fixed integer overflow in function vbi_capture_sim_load_caption in src/io-sim.c. Fixed integer overflow in function vbi_search_new in src/search.c.

*Credits: ninpwn

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

None

Privileges Required

None

User Interaction

None

System

Vulnerable | Subsequent

Confidentiality

Low

None

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

None

Automatable

Yes

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2025-02-28 CVE Published
2025-03-10 CVE Reserved
2025-03-11 CVE Updated
2025-07-11 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-824: Access of Uninitialized Pointer
CWE-908: Use of Uninitialized Resource

CAPEC

References (5)

URL	Tag	Source
https://github.com/zapping-vbi/zvbi/security/advisories/GHSA-g7cg-7gw9-v8cf	Related
https://vuldb.com/?id.299202	Technical Description
https://vuldb.com/?submit.512798	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://github.com/zapping-vbi/zvbi/commit/8def647eea27f7fd7ad33ff79c2d6d3e39948dce	2025-03-11
https://github.com/zapping-vbi/zvbi/releases/tag/v0.2.44	2025-03-11

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				*		-		Affected