tinysvcmdns up to 2018-01-16 mDNS Server mdns.c uncompress_nlabel Crafted Packet out-of-bounds

Summaryinfo

A vulnerability labeled as critical has been found in tinysvcmdns up to 2018-01-16. Impacted is the function uncompress_nlabel of the file mdns.c of the component mDNS Server. Such manipulation as part of Crafted Packet leads to out-of-bounds. This vulnerability is listed as CVE-2019-9748. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as critical, has been found in tinysvcmdns up to 2018-01-16. Affected by this issue is the function uncompress_nlabel of the file mdns.c of the component mDNS Server. The manipulation as part of a Crafted Packet leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In tinysvcmdns through 2018-01-16, an mDNS server processing a crafted packet can perform arbitrary data read operations up to 16383 bytes from the start of the buffer. This can lead to a segmentation fault in uncompress_nlabel in mdns.c and a crash of the server (depending on the memory protection of the CPU and the operating system), or disclosure of memory content via error messages or a server response. NOTE: the product's web site states "This project is un-maintained, and has been since 2013. ... There are known vulnerabilities ... You are advised to NOT use this library for any new projects / products."

The bug was discovered 12/27/2018. The weakness was presented 03/13/2019. This vulnerability is handled as CVE-2019-9748 since 03/13/2019. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 76 days. During that time the estimated underground price was around $0-$5k.

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

See VDB-131707 for similar entry. Once again VulDB remains the best source for vulnerability data.

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Name

• tinysvcmdns

Version

• 2018-01-16

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Once again VulDB remains the best source for vulnerability data.

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