Ubuntu update for python2.7



Risk High
Patch available YES
Number of vulnerabilities 7
CVE-ID CVE-2019-17514
CVE-2019-20907
CVE-2019-9674
CVE-2020-26116
CVE-2020-27619
CVE-2020-8492
CVE-2021-3177
CWE-ID CWE-20
CWE-835
CWE-400
CWE-93
CWE-94
CWE-399
CWE-119
Exploitation vector Network
Public exploit Public exploit code for vulnerability #6 is available.
Vulnerable software
 Ubuntu
Operating systems & Components / Operating system

python2.7-minimal (Ubuntu package)
Operating systems & Components / Operating system package or component

python2.7 (Ubuntu package)
Operating systems & Components / Operating system package or component

python3.7-minimal (Ubuntu package)
Operating systems & Components / Operating system package or component

python3.7 (Ubuntu package)
Operating systems & Components / Operating system package or component

python3.8-minimal (Ubuntu package)
Operating systems & Components / Operating system package or component

python3.8 (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains information about 7 vulnerabilities.

1) Input validation error

EUVDB-ID: #VU35161

Risk: Medium

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

CVE-ID: CVE-2019-17514

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

library/glob.html in the Python 2 and 3 documentation before 2016 has potentially misleading information about whether sorting occurs, as demonstrated by irreproducible cancer-research results. NOTE: the effects of this documentation cross application domains, and thus it is likely that security-relevant code elsewhere is affected. This issue is not a Python implementation bug, and there are no reports that NMR researchers were specifically relying on library/glob.html. In other words, because the older documentation stated "finds all the pathnames matching a specified pattern according to the rules used by the Unix shell," one might have incorrectly inferred that the sorting that occurs in a Unix shell also occurred for glob.glob. There is a workaround in newer versions of Willoughby nmr-data_compilation-p2.py and nmr-data_compilation-p3.py, which call sort() directly.

Mitigation

Update the affected package python2.7 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

python2.7-minimal (Ubuntu package): before 2.7.18-1~20.04.1

python2.7 (Ubuntu package): before 2.7.18-1~20.04.1

python3.7-minimal (Ubuntu package): before 3.7.5-2~18.04.4

python3.7 (Ubuntu package): before 3.7.5-2~18.04.4

python3.8-minimal (Ubuntu package): before 3.8.0-3~18.04.1

python3.8 (Ubuntu package): before 3.8.0-3~18.04.1

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4754-3


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) Infinite loop

EUVDB-ID: #VU32881

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-2019-20907

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

Description

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

The vulnerability exists due to infinite loop In Lib/tarfile.py in Python. A remote attacker can create a specially crafted TAR archive leading to an infinite loop when opened by tarfile.open, because _proc_pax lacks header validation.

Mitigation

Update the affected package python2.7 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

python2.7-minimal (Ubuntu package): before 2.7.18-1~20.04.1

python2.7 (Ubuntu package): before 2.7.18-1~20.04.1

python3.7-minimal (Ubuntu package): before 3.7.5-2~18.04.4

python3.7 (Ubuntu package): before 3.7.5-2~18.04.4

python3.8-minimal (Ubuntu package): before 3.8.0-3~18.04.1

python3.8 (Ubuntu package): before 3.8.0-3~18.04.1

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4754-3


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) Resource exhaustion

EUVDB-ID: #VU25630

Risk: Medium

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

CVE-ID: CVE-2019-9674

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

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

The vulnerability exists due to improper input validation in Lib/zipfile.py in Python when processing ZIP archives. A remote attacker can pass a specially crafted .zip archive to the application, trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Update the affected package python2.7 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

python2.7-minimal (Ubuntu package): before 2.7.18-1~20.04.1

python2.7 (Ubuntu package): before 2.7.18-1~20.04.1

python3.7-minimal (Ubuntu package): before 3.7.5-2~18.04.4

python3.7 (Ubuntu package): before 3.7.5-2~18.04.4

python3.8-minimal (Ubuntu package): before 3.8.0-3~18.04.1

python3.8 (Ubuntu package): before 3.8.0-3~18.04.1

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4754-3


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: #VU48592

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-26116

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

Exploit availability: No

Description

The vulnerability allows a remote attacker to inject arbitrary data in server response.

The vulnerability exists due to insufficient validation of attacker-supplied data in "http.client". A remote attacker can pass specially crafted data to the application containing CR-LF characters and modify application behavior.

Mitigation

Update the affected package python2.7 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

python2.7-minimal (Ubuntu package): before 2.7.18-1~20.04.1

python2.7 (Ubuntu package): before 2.7.18-1~20.04.1

python3.7-minimal (Ubuntu package): before 3.7.5-2~18.04.4

python3.7 (Ubuntu package): before 3.7.5-2~18.04.4

python3.8-minimal (Ubuntu package): before 3.8.0-3~18.04.1

python3.8 (Ubuntu package): before 3.8.0-3~18.04.1

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4754-3


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) Code Injection

EUVDB-ID: #VU50621

Risk: Medium

CVSSv4.0: 6.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-27619

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to Python executed eval() function on the code, retrieved via HTTP protocol in Lib/test/multibytecodec_support.py CJK codec tests. A remote attacker with ability to intercept network traffic can perform a Man-in-the-Middle (MitM) attack and execute arbitrary Python code on the system.

Mitigation

Update the affected package python2.7 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

python2.7-minimal (Ubuntu package): before 2.7.18-1~20.04.1

python2.7 (Ubuntu package): before 2.7.18-1~20.04.1

python3.7-minimal (Ubuntu package): before 3.7.5-2~18.04.4

python3.7 (Ubuntu package): before 3.7.5-2~18.04.4

python3.8-minimal (Ubuntu package): before 3.8.0-3~18.04.1

python3.8 (Ubuntu package): before 3.8.0-3~18.04.1

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4754-3


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

6) Resource management error

EUVDB-ID: #VU25631

Risk: Medium

CVSSv4.0: 2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2020-8492

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

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

The vulnerability exists due to improper input validation in urllib.request.AbstractBasicAuthHandler when processing HTTP responses. A remote attacker who controls a HTTP server can send a specially crafted HTTP response to the client application and conduct Regular Expression Denial of Service (ReDoS) attack.

Mitigation

Update the affected package python2.7 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

python2.7-minimal (Ubuntu package): before 2.7.18-1~20.04.1

python2.7 (Ubuntu package): before 2.7.18-1~20.04.1

python3.7-minimal (Ubuntu package): before 3.7.5-2~18.04.4

python3.7 (Ubuntu package): before 3.7.5-2~18.04.4

python3.8-minimal (Ubuntu package): before 3.8.0-3~18.04.1

python3.8 (Ubuntu package): before 3.8.0-3~18.04.1

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4754-3


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.

7) Buffer overflow

EUVDB-ID: #VU49973

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-3177

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary within the PyCArg_repr in _ctypes/callproc.c. A remote attacker can pass specially crafted input to the Python applications that accept floating-point numbers as untrusted input, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Update the affected package python2.7 to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

python2.7-minimal (Ubuntu package): before 2.7.18-1~20.04.1

python2.7 (Ubuntu package): before 2.7.18-1~20.04.1

python3.7-minimal (Ubuntu package): before 3.7.5-2~18.04.4

python3.7 (Ubuntu package): before 3.7.5-2~18.04.4

python3.8-minimal (Ubuntu package): before 3.8.0-3~18.04.1

python3.8 (Ubuntu package): before 3.8.0-3~18.04.1

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4754-3


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.



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