#VU38889 Out-of-bounds read in ytnef - CVE-2017-9474

Vulnerability identifier: #VU38889

Vulnerability 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-2017-9474

CWE-ID: CWE-125

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
ytnef
Other software / Other software solutions

Vendor: Yeraze (Randall Hand)

Description

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

The vulnerability exists due to a boundary error in In ytnef 1.9.2, the DecompressRTF function in lib/ytnef.c. A remote attacker can perform a denial of service (heap-based buffer over-read and application crash) via a crafted file.

Mitigation
Install update from vendor's website.

Vulnerable software versions

ytnef: 1.9.2

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External links
https://blogs.gentoo.org/ago/2017/05/24/ytnef-heap-based-buffer-overflow-in-decompressrtf-ytnef-c/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LFJWMUEUC4ILH2HEOCYVVLQT654ZMCGQ/

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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.