Fedora 27 update for cabextract, libmspack



| Updated: 2025-04-24
Risk High
Patch available YES
Number of vulnerabilities 5
CVE-ID CVE-2018-14680
CVE-2018-14681
CVE-2018-14682
CVE-2018-18584
CVE-2018-18585
CWE-ID CWE-20
CWE-121
CWE-787
CWE-476
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Public exploit code for vulnerability #2 is available.
Public exploit code for vulnerability #3 is available.
Vulnerable software
 Fedora
Operating systems & Components / Operating system

libmspack
Operating systems & Components / Operating system package or component

cabextract
Operating systems & Components / Operating system package or component

Vendor Fedoraproject

Security Bulletin

This security bulletin contains information about 5 vulnerabilities.

1) Improper input validation

EUVDB-ID: #VU14161

Risk: Low

CVSSv4.0: 5.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2018-14680

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a local attacker to cause DoS condition on the target system.

The vulnerability exists due to the chmd_read_headers() function, as defined in the mspack/chmd.c source code file of the affected software, does not reject blank CHM filenames. A local attacker can submit a CHM file with a blank filename and cause the service to crash.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 27

libmspack: before 0.9.1-0.1.alpha.fc27

cabextract: before 1.9-1.fc27

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2018-c73d257297


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

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.

2) Stack-based buffer overflow

EUVDB-ID: #VU14159

Risk: Low

CVSSv4.0: 7.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2018-14681

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The vulnerability exists due to stack-based buffer overflow in the kwajd_read_headers function, as defined in the mspack/kwajd.c source code file. A local attacker can send a specially crafted request that submits malicious input, trigger memory corruption and cause the service to crash or execute arbitrary code with elevated privileges.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 27

libmspack: before 0.9.1-0.1.alpha.fc27

cabextract: before 1.9-1.fc27

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2018-c73d257297


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

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) Stack-based buffer overflow

EUVDB-ID: #VU14160

Risk: Low

CVSSv4.0: 5.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2018-14682

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

The vulnerability allows a local attacker to cause DoS condition on the target system.

The vulnerability exists due to stack-based buffer overflow in the tolower macro, as defined in the mspack/chmd.c source code file. A local attacker can send a specially crafted request that submits malicious input, trigger memory corruption and cause the service to crash.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 27

libmspack: before 0.9.1-0.1.alpha.fc27

cabextract: before 1.9-1.fc27

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2018-c73d257297


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

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.

4) Out-of-bounds write

EUVDB-ID: #VU15530

Risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2018-18584

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

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition or execute arbitrary code on the target system.

The vulnerability exists in the mspack/cab.h source code file due to Microsoft cabinet file (CAB) with a Quantum-compressed block of exactly 38,912 B will write 1 B beyond the end of the input buffer. when handling malicious input. A remote unauthenticated attacker can trick the victim into accessing of a CAB file that submits malicious input to the targeted system, trigger an out-of-bounds write condition and cause the application to crash or execute arbitrary code with elevated privileges.

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

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 27

libmspack: before 0.9.1-0.1.alpha.fc27

cabextract: before 1.9-1.fc27

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2018-c73d257297


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) Null pointer dereference

EUVDB-ID: #VU15908

Risk: Low

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:Clear]

CVE-ID: CVE-2018-18585

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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

The vulnerability exists due to  the chmd_read_headers function, as defined in the mspack/chmd.c source code file of the affected software, accepts filenames that have embedded NULL bytes. A remote attacker can trick the victim into accessing a Compiled HTML (CHM) file that submits malicious input to the targeted system, trigger NULL pointer dereference and cause the service to crash.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 27

libmspack: before 0.9.1-0.1.alpha.fc27

cabextract: before 1.9-1.fc27

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2018-c73d257297


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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