A vulnerability was found in Netwide Assembler 2.14rc16 (Programming Tool Software) and classified as critical. Affected by this issue is the function expand_mmac_params of the file asm/preproc.c. The manipulation with an unknown input 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:

Netwide Assembler (NASM) 2.14rc16 has a heap-based buffer over-read in expand_mmac_params in asm/preproc.c for the special cases of the % and $ and ! characters.

The bug was discovered 10/29/2018. The weakness was published 11/12/2018 (Website). The advisory is shared for download at bugzilla.nasm.us. This vulnerability is handled as CVE-2018-19215 since 11/12/2018. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 14 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.

Similar entries are available at 126681, 126679 and 126678.

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Type

• Programming Tool Software

Name

• Netwide Assembler

Version

• 2.14rc16

License

• open-source

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