CVE-2026-13479— LoRaWAN 时钟同步应用时间应答越界读取漏洞
一分钟漏洞结论
影响对象
zephyrproject zephyr
利用判断
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建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
LoRaWAN 应用层时钟同步服务在 函数中解析下行消息（位于 ）。其命令处理循环仅保证一字节命令 ID 在有效范围内；对于 （即 AppTimeAns 命令），处理函数随后通过 读取 4 字节的时间修正值，并读取 1 字节的令牌（token），但未检查接收缓冲区中是否还剩余至少 5 个字节（ ）。因此，一个过短或经过构造的 AppTimeAns 消息会导致从解密后的载荷末尾之后多读最多 5 个字节。 该载荷（ ）是由注册的下行回调接收的解密后的应用层帧（ ）。要到达该处理函数，需要来自时钟同步端口的帧通过 LoR
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一、 漏洞 CVE-2026-13479 基础信息
漏洞信息
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Vulnerability Title
Out-of-bounds read in LoRaWAN clock-sync AppTimeAns downlink handler
来源: CVE Program / CVE List V5
Vulnerability Description
The LoRaWAN application-layer clock-synchronization service parses downlinks in clock_sync_package_callback() (subsys/lorawan/services/clock_sync.c). Its command loop only guarantees that the one-byte command id is in bounds; for the CLOCK_SYNC_CMD_APP_TIME (AppTimeAns) command the handler then reads a 4-byte time correction via sys_get_le32() plus a 1-byte token without checking that 5 bytes remain in the receive buffer (len - rx_pos). A short or crafted AppTimeAns therefore reads up to 5 bytes past the end of the decrypted payload.
The payload (rx_buf/len) is the decrypted application frame delivered to the registered downlink callback (mcps_indication->Buffer/BufferSize). Reaching the handler requires a frame on the clock-sync port that passes LoRaWAN's MAC integrity check and FRMPayload decryption, so the practical attacker is a malicious or compromised network/application server (the designated sender of AppTimeAns) or a party holding the session keys, rather than an arbitrary radio listener.
The over-read is bounded: the backing store is a fixed 255-byte static buffer, so the few stray bytes do not fault, and the read values (time_correction, token) are used only internally and never transmitted, so there is no disclosure to the attacker and no crash. The sole effect is that a stale token matching ctx.req_token can apply a garbage time_correction to the device's own clock offset (ctx.time_offset), a minor integrity impact confined to the victim's time estimate. The fix adds an explicit length check that drops a too-short AppTimeAns. Note the sibling one-byte reads in the periodicity and force-resync handlers remain unguarded with the same negligible impact.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| zephyrproject | zephyr | 3.3.0 ~ 4.4.2 | - |
|
二、漏洞 CVE-2026-13479 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-13479 其他参考 (2)
同批安全公告 · zephyrproject · 2026-08-26 · 共 3 条
| CVE-2026-13481 | 5.4 MEDIUM | Zephyr PTP时间解析越界读取漏洞 |
| CVE-2026-13480 | 3.1 LOW | LoRaWAN 下行处理器越界读取漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-13479
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