Ubuntu update for unzip



Risk High
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2021-4217
CVE-2022-0529
CVE-2022-0530
CWE-ID CWE-476
CWE-787
CWE-122
Exploitation vector Network
Public exploit Public exploit code for vulnerability #2 is available.
Public exploit code for vulnerability #3 is available.
Vulnerable software
 Ubuntu
Operating systems & Components / Operating system

unzip (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) NULL pointer dereference

EUVDB-ID: #VU68298

Risk: Medium

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-4217

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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

The vulnerability exists due to a NULL pointer dereference error in unzip when handling Unicode strings. A remote attacker can trick the victim to open a specially crafted archive and perform a denial of service (DoS) attack.

Mitigation

Update the affected package unzip to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 22.04

unzip (Ubuntu package): before Ubuntu Pro (Infra-only)

CPE2.3 External links

https://ubuntu.com/security/notices/USN-5673-1


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) Out-of-bounds write

EUVDB-ID: #VU66220

Risk: High

CVSSv4.0: 7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2022-0529

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing zip archives during the conversion of a UTF-8 string to a local string. A remote attacker can create a specially crafted zip file, trick the victim into opening it using the affected software, trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation

Update the affected package unzip to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 22.04

unzip (Ubuntu package): before Ubuntu Pro (Infra-only)

CPE2.3 External links

https://ubuntu.com/security/notices/USN-5673-1


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.

3) Heap-based buffer overflow

EUVDB-ID: #VU63289

Risk: High

CVSSv4.0: 7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2022-0530

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: Yes

Description

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

The vulnerability exists due to a boundary error. A remote attacker can pass specially crafted data to the application, trigger a heap-based buffer overflow 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 unzip to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 22.04

unzip (Ubuntu package): before Ubuntu Pro (Infra-only)

CPE2.3 External links

https://ubuntu.com/security/notices/USN-5673-1


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.



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