SB2018060510 - Multiple vulnerabilities in mruby

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Main Vulnerability Database SB2018060510

SB2018060510 - Multiple vulnerabilities in mruby

Published: June 5, 2018 Updated: August 8, 2020

Security Bulletin ID SB2018060510
Severity
High
Patch available
NO
Number of vulnerabilities 5
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 20% Medium 80%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 5 secuirty vulnerabilities.


1) Integer overflow (CVE-ID: CVE-2018-14337)

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists in mrbgems/mruby-sprintf/src/sprintf.c within the CHECK macro. A remote attacker can trigger integer overflow due to the mrb_str_resize function in string.c does not check for a negative length.


2) NULL pointer dereference (CVE-ID: CVE-2018-12247)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in mruby 1.4.1. There is a NULL pointer dereference in mrb_class, related to certain .clone usage, because mrb_obj_clone in kernel.c copies flags other than the MRB_FLAG_IS_FROZEN flag (e.g., the embedded flag). A remote attacker can perform a denial of service (DoS) attack.


3) Out-of-bounds read (CVE-ID: CVE-2018-12248)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to heap-based buffer over-read associated with OP_ENTER because mrbgems/mruby-fiber/src/fiber.c does not extend the stack in cases of many arguments to fiber. A remote attacker can perform a denial of service attack.


4) NULL pointer dereference (CVE-ID: CVE-2018-12249)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in mruby 1.4.1. There is a NULL pointer dereference in mrb_class_real because "class BasicObject" is not properly supported in class.c. A remote attacker can perform a denial of service (DoS) attack.


5) Access of Uninitialized Pointer (CVE-ID: CVE-2018-11743)

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

The init_copy function in kernel.c in mruby 1.4.1 makes initialize_copy calls for TT_ICLASS objects, which allows attackers to cause a denial of service (mrb_hash_keys uninitialized pointer and application crash) or possibly have unspecified other impact.


Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References