Red Hat Software Collections update for python27-python and python27-python-jinja2

Published: 2019-05-22

Risk	Medium
Patch available	YES
Number of vulnerabilities	6
CVE-ID	CVE-2016-10745 CVE-2018-1060 CVE-2018-1061 CVE-2018-14647 CVE-2019-9740 CVE-2019-9947
CWE-ID	CWE-200 CWE-20 CWE-611 CWE-93
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #5 is available. Public exploit code for vulnerability #6 is available.
Vulnerable software	python27-python-jinja2 (Red Hat package) Operating systems & Components / Operating system package or component python27-python (Red Hat package) Operating systems & Components / Operating system package or component
Vendor	Red Hat Inc.

Security Bulletin

This security bulletin contains information about 6 vulnerabilities.

1) Information disclosure

EUVDB-ID: #VU23000

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2016-10745

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

Exploit availability: No

Description

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

The vulnerability exists due to information disclosure in str.format in Pallets Jinja. A remote attacker can gain unauthorized access to sensitive information and use it to escape sandbox.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

python27-python-jinja2 (Red Hat package): before 2.6-12.el6

python27-python (Red Hat package): before 2.7.16-4.el6

CPE2.3

External links

https://access.redhat.com/errata/RHSA-2019:1260

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) Improper input validation

EUVDB-ID: #VU12283

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2018-1060

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on he target system.

The weakness exists due to the way catastrophic backtracking was implemented in apop() method in pop3lib. A remote attacker can cause the service to crash.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

python27-python-jinja2 (Red Hat package): before 2.6-12.el6

python27-python (Red Hat package): before 2.7.16-4.el6

CPE2.3

External links

https://access.redhat.com/errata/RHSA-2019:1260

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) Improper input validation

EUVDB-ID: #VU12282

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2018-1061

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on he target system.

The weakness exists due to the way catastrophic backtracking was implemented in python's difflib.IS_LINE_JUNK method difflib. A remote attacker can cause the service to crash.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

python27-python-jinja2 (Red Hat package): before 2.6-12.el6

python27-python (Red Hat package): before 2.7.16-4.el6

CPE2.3

External links

https://access.redhat.com/errata/RHSA-2019:1260

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) XXE attack

EUVDB-ID: #VU15760

Risk: Low

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-14647

CWE-ID: CWE-611 - Improper Restriction of XML External Entity Reference ('XXE')

Exploit availability: No

Description

The vulnerability allows a remote attacker to conduct XXE-attack.

The vulnerability exists due to improper handling of XML External Entities (XXEs) when parsing an XML file. A remote attacker can trick the victim into open an XML file that submits malicious input, trigger pathological hash collisions in Expat's internal data structures, consume large amounts CPU and RAM, and cause a denial of service (DoS) condition.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

python27-python-jinja2 (Red Hat package): before 2.6-12.el6

python27-python (Red Hat package): before 2.7.16-4.el6

CPE2.3

External links

https://access.redhat.com/errata/RHSA-2019:1260

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) CRLF injection

EUVDB-ID: #VU18829

Risk: Medium

CVSSv4.0: 2.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/U:Green]

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

Install updates from vendor's website.

Vulnerable software versions

python27-python-jinja2 (Red Hat package): before 2.6-12.el6

python27-python (Red Hat package): before 2.7.16-4.el6

CPE2.3

External links

https://access.redhat.com/errata/RHSA-2019:1260

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) CRLF injection

EUVDB-ID: #VU18828

Risk: Medium

CVSSv4.0: 2.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/U:Green]

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

Install updates from vendor's website.

Vulnerable software versions

python27-python-jinja2 (Red Hat package): before 2.6-12.el6

python27-python (Red Hat package): before 2.7.16-4.el6

CPE2.3

External links

https://access.redhat.com/errata/RHSA-2019:1260

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.