Multiple vulnerabilities in mruby
| Risk | High |
| Patch available | NO |
| Number of vulnerabilities | 5 |
| CVE-ID | CVE-2018-14337 CVE-2018-12247 CVE-2018-12248 CVE-2018-12249 CVE-2018-11743 |
| CWE-ID | CWE-190 CWE-476 CWE-125 CWE-824 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
mruby Universal components / Libraries / Scripting languages |
| Vendor | mruby |
Security Bulletin
This security bulletin contains information about 5 vulnerabilities.
1) Integer overflow
EUVDB-ID: #VU36897
Risk: Medium
CVSSv3.1: 6.9 [AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:U/RC:C]
CVE-ID: CVE-2018-14337
CWE-ID:
CWE-190 - Integer overflow
Exploit availability: No
DescriptionThe 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.
MitigationCybersecurity Help is currently unaware of any official solution to address this vulnerability.
Vulnerable software versionsmruby: 1.4.1
CPE2.3 External linkshttp://github.com/mruby/mruby/issues/4062
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) NULL pointer dereference
EUVDB-ID: #VU37057
Risk: Medium
CVSSv3.1: 6.9 [AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]
CVE-ID: CVE-2018-12247
CWE-ID:
CWE-476 - NULL Pointer Dereference
Exploit availability: No
DescriptionThe 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.
MitigationCybersecurity Help is currently unaware of any official solution to address this vulnerability.
Vulnerable software versionsmruby: 1.4.1
CPE2.3 External linkshttp://github.com/mruby/mruby/commit/55edae0226409de25e59922807cb09acb45731a2
http://github.com/mruby/mruby/issues/4036
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
3) Out-of-bounds read
EUVDB-ID: #VU37058
Risk: Medium
CVSSv3.1: 6.9 [AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]
CVE-ID: CVE-2018-12248
CWE-ID:
CWE-125 - Out-of-bounds read
Exploit availability: No
DescriptionThe 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.
MitigationCybersecurity Help is currently unaware of any official solution to address this vulnerability.
Vulnerable software versionsmruby: 1.4.1
CPE2.3 External linkshttp://github.com/mruby/mruby/commit/778500563a9f7ceba996937dc886bd8cde29b42b
http://github.com/mruby/mruby/issues/4038
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
4) NULL pointer dereference
EUVDB-ID: #VU37059
Risk: Medium
CVSSv3.1: 6.9 [AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]
CVE-ID: CVE-2018-12249
CWE-ID:
CWE-476 - NULL Pointer Dereference
Exploit availability: No
DescriptionThe 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.
MitigationCybersecurity Help is currently unaware of any official solution to address this vulnerability.
Vulnerable software versionsmruby: 1.4.1
CPE2.3 External linkshttp://github.com/mruby/mruby/commit/faa4eaf6803bd11669bc324b4c34e7162286bfa3
http://github.com/mruby/mruby/issues/4037
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
5) Access of Uninitialized Pointer
EUVDB-ID: #VU37083
Risk: High
CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2018-11743
CWE-ID:
CWE-824 - Access of Uninitialized Pointer
Exploit availability: No
DescriptionThe 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.
MitigationInstall update from vendor's website.
Vulnerable software versionsmruby: 1.4.1
CPE2.3 External linkshttp://github.com/mruby/mruby/commit/b64ce17852b180dfeea81cf458660be41a78974d
http://github.com/mruby/mruby/issues/4027
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
