Denial of service in tnef



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-18849
CWE-ID CWE-126
Exploitation vector Network
Public exploit N/A
Vulnerable software
 tnef
Universal components / Libraries / Libraries used by multiple products

Vendor verdammelt

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Buffer Over-read

EUVDB-ID: #VU22642

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-18849

CWE-ID: CWE-126 - Buffer over-read

Exploit availability: No

Description

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

The vulnerability exists due to the heap-based buffer over-read involving strdup. A remote attacker can write to the victim's ".ssh/authorized_keys" file via an e-mail message with a crafted winmail.dat application/ms-tnef attachment and crash the application.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

tnef: 1.4.10 - 1.4.17

CPE2.3 External links

http://github.com/verdammelt/tnef/compare/1.4.17...1.4.18
http://github.com/verdammelt/tnef/pull/40


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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