Hancom Thinkfree Office NEO 9.6.1.4902 Hangul Word Processor memory corruption

Summaryinfo

A vulnerability classified as critical has been found in Hancom Thinkfree Office NEO 9.6.1.4902. Affected by this issue is some unknown functionality of the component Hangul Word Processor. Performing a manipulation results in memory corruption. This vulnerability is identified as CVE-2017-2819. The attack is only possible with local access. There is not any exploit available.

Detailsinfo

A vulnerability was found in Hancom Thinkfree Office NEO 9.6.1.4902. It has been classified as critical. This affects some unknown processing of the component Hangul Word Processor. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

An exploitable heap-based buffer overflow exists in the Hangul Word Processor component (version 9.6.1.4350) of Hancom Thinkfree Office NEO 9.6.1.4902. A specially crafted document stream can cause an integer underflow resulting in a buffer overflow which can lead to code execution under the context of the application. An attacker can entice a user to open up a document in order to trigger this vulnerability.

The bug was discovered 05/12/2017. The weakness was released 05/24/2017 (Website). It is possible to read the advisory at talosintelligence.com. This vulnerability is uniquely identified as CVE-2017-2819 since 12/01/2016. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 12 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370505 (Hangul Word Processor Buffer Overflow Vulnerability).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Hancom

Name

• Thinkfree Office NEO

Version

• 9.6.1.4902

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