mruby 1.4.0 src/vm.c mrb_vm_exec integer overflow

Summaryinfo

A vulnerability marked as critical has been reported in mruby 1.4.0. This vulnerability affects the function mrb_vm_exec of the file src/vm.c. Performing a manipulation results in integer overflow. This vulnerability is known as CVE-2018-10191. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in mruby 1.4.0 (Programming Language Software). It has been classified as critical. This affects the function mrb_vm_exec of the file src/vm.c. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In versions of mruby up to and including 1.4.0, an integer overflow exists in src/vm.c::mrb_vm_exec() when handling OP_GETUPVAR in the presence of deep scope nesting, resulting in a use-after-free. An attacker that can cause Ruby code to be run can use this to possibly execute arbitrary code.

The bug was discovered 04/11/2018. The weakness was published 04/17/2018 (Website). It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2018-10191 since 04/17/2018. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 6 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.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Programming Language Software

Name

• mruby

Version

• 1.4.0

License

• open-source

Website

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

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