A vulnerability classified as critical was found in ytnef up to 1.9.2 (Document Reader Software). This vulnerability affects the function TNEFFillMapi in the library lib/ytnef.c of the component libytnef. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The TNEFFillMapi function in lib/ytnef.c in libytnef in ytnef through 1.9.2 does not ensure a nonzero count value before a certain memory allocation, which allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted tnef file.

The bug was discovered 05/15/2017. The weakness was published 05/22/2017 (Website). The advisory is shared for download at bugs.debian.org. This vulnerability was named CVE-2017-9146 since 05/22/2017. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 7 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 110286 (Ubuntu 14.04 LTS : libytnef vulnerabilities (USN-3667-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 197154 (Ubuntu Security Notification for Libytnef Vulnerabilities (USN-3667-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 years after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (110286). Similar entries are available at VDB-101470, VDB-102039, VDB-102041 and VDB-104738.

Productinfo

Type

• Document Reader Software

Name

• ytnef

Version

• 1.9.0
• 1.9.1
• 1.9.2

License

• open-source

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CPE 2.2info

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