Ubuntu update for ruby2.3

1) Input validation error

EUVDB-ID: #VU32971

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-10663

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to manipulate data.

The JSON gem through 2.2.0 for Ruby, as used in Ruby 2.4 through 2.4.9, 2.5 through 2.5.7, and 2.6 through 2.6.5, has an Unsafe Object Creation Vulnerability. This is quite similar to CVE-2013-0269, but does not rely on poor garbage-collection behavior within Ruby. Specifically, use of JSON parsing methods can lead to creation of a malicious object within the interpreter, with adverse effects that are application-dependent.

Mitigation

Update the affected package ruby2.3 to the latest version.

Vulnerable software versions

Ubuntu: 16.04 - 20.10

ruby2.7 (Ubuntu package): before 2.7.1-3ubuntu1.2

libruby2.7 (Ubuntu package): before 2.7.1-3ubuntu1.2

ruby2.5 (Ubuntu package): before 2.5.1-1ubuntu1.8

libruby2.5 (Ubuntu package): before 2.5.1-1ubuntu1.8

ruby2.3 (Ubuntu package): before 2.3.1-2~ubuntu16.04.15

libruby2.3 (Ubuntu package): before 2.3.1-2~ubuntu16.04.15

External links

http://ubuntu.com/security/notices/USN-4882-1

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) Information disclosure

EUVDB-ID: #VU31886

Risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-10933

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to BasicSocket#read_nonblock method outputs previous value of the heap instead of copying the requested data. A remote attacker can gain access to sensitive information on the system.

Mitigation

Update the affected package ruby2.3 to the latest version.

Vulnerable software versions

Ubuntu: 16.04 - 20.10

ruby2.7 (Ubuntu package): before 2.7.1-3ubuntu1.2

libruby2.7 (Ubuntu package): before 2.7.1-3ubuntu1.2

ruby2.5 (Ubuntu package): before 2.5.1-1ubuntu1.8

libruby2.5 (Ubuntu package): before 2.5.1-1ubuntu1.8

ruby2.3 (Ubuntu package): before 2.3.1-2~ubuntu16.04.15

libruby2.3 (Ubuntu package): before 2.3.1-2~ubuntu16.04.15

External links

http://ubuntu.com/security/notices/USN-4882-1

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) Inconsistent interpretation of HTTP requests

EUVDB-ID: #VU47333

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-25613

CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to preform HTTP request smuggling attacks.

The vulnerability exists due to improper validation of HTTP requests. A remote attacker can send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers.

Successful exploitation of vulnerability may allow an attacker to poison HTTP cache and perform phishing attacks.

Mitigation

Update the affected package ruby2.3 to the latest version.

Vulnerable software versions

Ubuntu: 16.04 - 20.10

ruby2.7 (Ubuntu package): before 2.7.1-3ubuntu1.2

libruby2.7 (Ubuntu package): before 2.7.1-3ubuntu1.2

ruby2.5 (Ubuntu package): before 2.5.1-1ubuntu1.8

libruby2.5 (Ubuntu package): before 2.5.1-1ubuntu1.8

ruby2.3 (Ubuntu package): before 2.3.1-2~ubuntu16.04.15

libruby2.3 (Ubuntu package): before 2.3.1-2~ubuntu16.04.15

External links

http://ubuntu.com/security/notices/USN-4882-1

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. However, proof of concept for this vulnerability is available.