Gentoo update for Python

1) Information disclosure

EUVDB-ID: #VU19256

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-20852

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 the "http.cookiejar.DefaultPolicy.domain_return_ok" in the "Lib/http/cookiejar.py" file returns incorrect results during cookie domain checks. A remote attacker can trick a victim to execute a program that uses the "http.cookiejar.DefaultPolicy" to make an HTTP connection to an attacker-controlled server with a hostname that has another valid hostname as a suffix.

Successful exploitation of this vulnerability can allow an attacker to gain unauthorized access to sensitive information on the system, such as existing cookies.

Mitigation

Update the affected packages.
dev-lang/python to version:

Vulnerable software versions

Gentoo Linux: All versions

CPE2.3

• cpe:2.3:o:gentoo:gentoo_linux:*:*:*:*:*:*:*:

External links

http://security.gentoo.org/
http://security.gentoo.org/glsa/202003-26

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: #VU17805

Risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-5010

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: Yes

Description

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

The vulnerability exists due to the X509 certificate parser of the affected software improperly handles X509 certificates with a certificate extension that uses a Certificate Revocation List (CRL) distribution point with empty distributionPoint and cRLIssuer fields. A remote attacker can send a request to initiate a Transport Layer Security (TLS) connection using an X509 certificate that submits malicious input, trigger a NULL pointer dereference condition that causes the application to crash, resulting in a DoS condition.

Mitigation

Update the affected packages.
dev-lang/python to version:

Vulnerable software versions

Gentoo Linux: All versions

CPE2.3

• cpe:2.3:o:gentoo:gentoo_linux:*:*:*:*:*:*:*:

External links

http://security.gentoo.org/
http://security.gentoo.org/glsa/202003-26

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.

3) Input validation error

EUVDB-ID: #VU18355

Risk: Medium

CVSSv3.1: 6.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-9636

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists due to insufficient validation of user-supplied input when processing data in Unicode encoding with an incorrect netloc during NFKC normalization. A remote attacker can gain access to sensitive information.

Mitigation

Update the affected packages.
dev-lang/python to version:

Vulnerable software versions

Gentoo Linux: All versions

CPE2.3

• cpe:2.3:o:gentoo:gentoo_linux:*:*:*:*:*:*:*:

External links

http://security.gentoo.org/
http://security.gentoo.org/glsa/202003-26

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) CRLF injection

EUVDB-ID: #VU18829

Risk: Medium

CVSSv3.1: 4.3 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-9740

CWE-ID: CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform CRLF injection attacks.

The vulnerability exists within urllib2 implementation for Python 2.x and urllib3 implementation for Python 3.x when processing the path component of a URL after the "?" character within the urllib.request.urlopen() call. A remote attacker with ability to control URL, passed to the application, can use CRLF sequences to split the HTTP request and inject arbitrary HTTP headers into request, made by the application.

Mitigation

Update the affected packages.
dev-lang/python to version:

Vulnerable software versions

Gentoo Linux: All versions

CPE2.3

• cpe:2.3:o:gentoo:gentoo_linux:*:*:*:*:*:*:*:

External links

http://security.gentoo.org/
http://security.gentoo.org/glsa/202003-26

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.

5) CRLF injection

EUVDB-ID: #VU18828

Risk: Medium

CVSSv3.1: 4.3 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-9947

CWE-ID: CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform CRLF injection attacks.

The vulnerability exists within urllib2 implementation for Python 2.x and urllib3 implementation for Python 3.x when processing the path component of a URL that lacks the "?" character within the urllib.request.urlopen() call. A remote attacker with ability to control URL, passed to the application, can use CRLF sequences to split the HTTP request and inject arbitrary HTTP headers into request, made by the application.

Mitigation

Update the affected packages.
dev-lang/python to version:

Vulnerable software versions

Gentoo Linux: All versions

CPE2.3

• cpe:2.3:o:gentoo:gentoo_linux:*:*:*:*:*:*:*:

External links

http://security.gentoo.org/
http://security.gentoo.org/glsa/202003-26

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.

6) Exposed dangerous method or function

EUVDB-ID: #VU18827

Risk: Medium

CVSSv3.1: 6.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-9948

CWE-ID: CWE-749 - Exposed Dangerous Method or Function

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to urllib implementation in Python 2.x supports the local_file: scheme. An attacker with ability to control input data, such as URL, can bypass protection mechanisms that blacklist file: URIs and view contents of arbitrary file on the system.

PoC:

urllib.urlopen('local_file:///etc/passwd')

Mitigation

Update the affected packages.
dev-lang/python to version:

Vulnerable software versions

Gentoo Linux: All versions

CPE2.3

• cpe:2.3:o:gentoo:gentoo_linux:*:*:*:*:*:*:*:

External links

http://security.gentoo.org/
http://security.gentoo.org/glsa/202003-26

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.