Multiple vulnerabilities in ytnef



Risk High
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2021-3403
CVE-2021-3404
CWE-ID CWE-415
CWE-122
Exploitation vector Network
Public exploit N/A
Vulnerable software
 ytnef
Other software / Other software solutions

Vendor Yeraze (Randall Hand)

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Double Free

EUVDB-ID: #VU56712

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-2021-3403

CWE-ID: CWE-415 - Double Free

Exploit availability: No

Description

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

The vulnerability exists due to a double free error within the TNEFSubjectHandler() function in lib/ytnef.c. A remote attacker can trick the victim to open a specially crafted file, trigger a double free error and execute arbitrary code on the target system.

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

Mitigation

Install update from vendor's website.

Vulnerable software versions

ytnef: 1.7 - 1.9.3

CPE2.3 External links

https://bugzilla.redhat.com/show_bug.cgi?id=1926967
https://github.com/Yeraze/ytnef/issues/85


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) Heap-based buffer overflow

EUVDB-ID: #VU56713

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-2021-3404

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

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 error within the SwapWord() function in lib/ytnef.c. A remote attacker can trick the victim to open a specially crafted file, 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

Install updates from vendor's website.

Vulnerable software versions

ytnef: 1.7 - 1.9.3

CPE2.3 External links

https://bugzilla.redhat.com/show_bug.cgi?id=1926965
https://github.com/Yeraze/ytnef/issues/86


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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