漏洞信息
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Vulnerability Title
Contiki-NG DNS/mDNS Resolver Out-of-Bounds Read via Unchecked skip_name Traversal Before Transaction-ID Validation
Vulnerability Description
Contiki-NG's DNS/mDNS resolver skip_name() in os/services/resolv/resolv.c walks DNS wire-format name labels with no packet-boundary check, and the caller in newdata() invokes it in a loop iterating nquestions times from the attacker-controlled DNS header before validating the transaction ID. An attacker who sets nquestions higher than the number of complete questions present causes skip_name() to walk past the UDP packet buffer, and the returned pointer is cast to struct dns_answer * for further memory reads. On builds with RESOLV_CONF_SUPPORTS_MDNS enabled, any peer on the local segment can trigger the read unauthenticated via a multicast UDP 5353 packet with no outstanding query required; on standard DNS builds an attacker who can inject a UDP response from port 53 during an outstanding query can trigger the same read. Impact is out-of-bounds read of uip_buf and adjacent memory, disclosing memory contents or crashing the resolver.
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
Vulnerability Type
跨界内存读
Vulnerability Title
Contiki-NG 缓冲区错误漏洞
Vulnerability Description
Contiki-NG是Contiki-NG组织开源的一个适用于物联网中资源受限设备的操作系统。 Contiki-NG存在缓冲区错误漏洞,该漏洞源于DNS/mDNS解析器中的skip_name()函数在遍历DNS wire格式名称标签时未检查数据包边界,在验证事务ID前根据攻击者控制的nquestions循环调用,可能导致越界读取uip_buf及相邻内存,泄露内存内容或导致解析器崩溃。
CVSS Information
N/A
Vulnerability Type
N/A