CVE-2018-8778

ruby: Buffer under-read in String#unpack

Severity Score

7.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In Ruby before 2.2.10, 2.3.x before 2.3.7, 2.4.x before 2.4.4, 2.5.x before 2.5.1, and 2.6.0-preview1, an attacker controlling the unpacking format (similar to format string vulnerabilities) can trigger a buffer under-read in the String#unpack method, resulting in a massive and controlled information disclosure.

En Ruby, en versiones anteriores a la 2.2.10, versiones 2.3.x anteriores a la 2.3.7, versiones 2.4.x anteriores a la 2.4.4, versiones 2.5.x anteriores a la 2.5.1 y la versión 2.6.0-preview1, un atacante que controla el formato de desempaquetado (similar a las vulnerabilidades de cadena de formato) puede desencadenar una sublectura de búfer en el método String#unpack. Esto resulta en una gran divulgación de información controlada.

A integer underflow was found in the way String#unpack decodes the unpacking format. An attacker, able to control the unpack format, could use this flaw to disclose arbitrary parts of the application's memory.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-03-19 CVE Reserved
2018-03-30 CVE Published
2024-07-07 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-134: Use of Externally-Controlled Format String

CAPEC

References (19)

URL	Tag	Source
http://www.securityfocus.com/bid/103693	Third Party Advisory
http://www.securitytracker.com/id/1042004	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/04/msg00023.html	Mailing List
https://lists.debian.org/debian-lts-announce/2018/04/msg00024.html	Mailing List
https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html	Mailing List

URL	Date	SRC

URL	Date	SRC
https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-2-10-released	2019-10-03
https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-3-7-released	2019-10-03
https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-4-4-released	2019-10-03
https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-5-1-released	2019-10-03

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html	2019-10-03
https://access.redhat.com/errata/RHSA-2018:3729	2019-10-03
https://access.redhat.com/errata/RHSA-2018:3730	2019-10-03
https://access.redhat.com/errata/RHSA-2018:3731	2019-10-03
https://access.redhat.com/errata/RHSA-2019:2028	2019-10-03
https://usn.ubuntu.com/3626-1	2019-10-03
https://www.debian.org/security/2018/dsa-4259	2019-10-03
https://www.ruby-lang.org/en/news/2018/03/28/buffer-under-read-unpack-cve-2018-8778	2019-10-03
https://access.redhat.com/security/cve/CVE-2018-8778	2020-05-26
https://bugzilla.redhat.com/show_bug.cgi?id=1561953	2020-05-26

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Ruby-lang Search vendor "Ruby-lang"		Ruby Search vendor "Ruby-lang" for product "Ruby"				>= 2.2.0 < 2.2.10 Search vendor "Ruby-lang" for product "Ruby" and version " >= 2.2.0 < 2.2.10"		-		Affected
Ruby-lang Search vendor "Ruby-lang"		Ruby Search vendor "Ruby-lang" for product "Ruby"				>= 2.3.0 < 2.3.7 Search vendor "Ruby-lang" for product "Ruby" and version " >= 2.3.0 < 2.3.7"		-		Affected
Ruby-lang Search vendor "Ruby-lang"		Ruby Search vendor "Ruby-lang" for product "Ruby"				>= 2.4.0 < 2.4.4 Search vendor "Ruby-lang" for product "Ruby" and version " >= 2.4.0 < 2.4.4"		-		Affected
Ruby-lang Search vendor "Ruby-lang"		Ruby Search vendor "Ruby-lang" for product "Ruby"				>= 2.5.0 < 2.5.1 Search vendor "Ruby-lang" for product "Ruby" and version " >= 2.5.0 < 2.5.1"		-		Affected
Ruby-lang Search vendor "Ruby-lang"		Ruby Search vendor "Ruby-lang" for product "Ruby"				2.6.0 Search vendor "Ruby-lang" for product "Ruby" and version "2.6.0"		preview1		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				14.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				16.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				17.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "17.10"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				7.0 Search vendor "Debian" for product "Debian Linux" and version "7.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				6.0 Search vendor "Redhat" for product "Enterprise Linux" and version "6.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				7.0 Search vendor "Redhat" for product "Enterprise Linux" and version "7.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				7.4 Search vendor "Redhat" for product "Enterprise Linux" and version "7.4"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				7.5 Search vendor "Redhat" for product "Enterprise Linux" and version "7.5"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				7.6 Search vendor "Redhat" for product "Enterprise Linux" and version "7.6"		-		Affected