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CVE-2025-24903— libsignal-service-rs Doesn't Check Origin of Sync Messages

Quick assessment

Affected
whisperfish libsignal-service-rs
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libsignal-service-rs是Whisperfish开源的一个用于与 Signal 服务器通信的 libsignal 服务。 libsignal-service-rs存在数据伪造问题漏洞，该漏洞源于未验证同步消息来源，允许设备冒充。

CVSS 8.5 · High EPSS 0.19% · P7

Possible ATT&CK Techniques 1 AI

T1199 · Trusted Relationship
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I. Basic Information for CVE-2025-24903

Vulnerability Information
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Vulnerability Title
libsignal-service-rs Doesn't Check Origin of Sync Messages
Source: CVE Program / CVE List V5
Vulnerability Description
libsignal-service-rs is a Rust version of the libsignal-service-java library which implements the core functionality to communicate with Signal servers. Prior to commit 82d70f6720e762898f34ae76b0894b0297d9b2f8, any contact may forge a sync message, impersonating another device of the local user. The origin of sync messages is not checked. Patched libsignal-service can be found after commit 82d70f6720e762898f34ae76b0894b0297d9b2f8. The `Metadata` struct contains an additional `was_encrypted` field, which breaks the API, but should be easily resolvable. No known workarounds are available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
libsignal-service-rs 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libsignal-service-rs是Whisperfish开源的一个用于与 Signal 服务器通信的 libsignal 服务。 libsignal-service-rs存在数据伪造问题漏洞，该漏洞源于未验证同步消息来源，允许设备冒充。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
whisperfish libsignal-service-rs < 82d70f6720e762898f34ae76b0894b0297d9b2f8 -

II. Public POCs for CVE-2025-24903

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10337 chars
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III. Intelligence Information for CVE-2025-24903

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Patches & Fixes for CVE-2025-24903 (1)

Vendor Advisories for CVE-2025-24903 (1)

IV. Related Vulnerabilities

Same product: libsignal-service-rs
Same vendor: whisperfish
Same weakness: CWE-345

V. Comments for CVE-2025-24903

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