mruby 1.4.1 CHECK Macro sprintf.c mrb_str_resize Negative Length integer overflow

Summaryinfo

A vulnerability classified as critical was found in mruby 1.4.1. The affected element is the function mrb_str_resize of the file mrbgems/mruby-sprintf/src/sprintf.c of the component CHECK Macro. Executing a manipulation as part of Negative Length can lead to integer overflow. The identification of this vulnerability is CVE-2018-14337. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in mruby 1.4.1 (Programming Language Software). It has been declared as critical. This vulnerability affects the function mrb_str_resize of the file mrbgems/mruby-sprintf/src/sprintf.c of the component CHECK Macro. The manipulation as part of a Negative Length leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The CHECK macro in mrbgems/mruby-sprintf/src/sprintf.c in mruby 1.4.1 contains a signed integer overflow, possibly leading to out-of-bounds memory access because the mrb_str_resize function in string.c does not check for a negative length.

The bug was discovered 06/25/2018. The weakness was shared 07/17/2018 (Website). The advisory is available at github.com. This vulnerability was named CVE-2018-14337 since 07/16/2018. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 21 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.

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Productinfo

Type

• Programming Language Software

Name

• mruby

Version

• 1.4.1

License

• open-source

Website

• Product: https://github.com/mruby/mruby/

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