Virtual Event: Threat Detection and Incident Response Summit - Watch Sessions
Connect with us

Hi, what are you looking for?



Adobe Patches Disclosed Acrobat Vulnerability

Adobe has released Patch Tuesday updates for Flash Player, Acrobat and Reader, and Photoshop CC to address three vulnerabilities – one in each product.

Adobe has released Patch Tuesday updates for Flash Player, Acrobat and Reader, and Photoshop CC to address three vulnerabilities – one in each product.

The most interesting update is for the Windows version of Acrobat and Reader. It addresses an information disclosure vulnerability for which a proof-of-concept (PoC) exploit is already publicly available.

According to Adobe, exploitation of the flaw, tracked as CVE-2018-15979, “could lead to an inadvertent leak of the user’s hashed NTLM password.”

The security hole, credited by Adobe to free exploit detection service EdgeSpot, has been classified as “important severity,” but it has been assigned a priority rating of “1,” which indicates that there is a high risk of exploitation.

This is not the first time we hear of an Acrobat vulnerability that can be exploited to obtain NTLM credentials. In April, Check Point disclosed the details of a similar vulnerability, tracked as CVE-2018-4993, that could have been exploited by injecting malicious content into a PDF which would cause NTLM hashes to be automatically leaked when the file was opened. Adobe initially said it did not plan on releasing a fix, but a few weeks later it decided to release patches and mitigations.

Since in both cases Adobe has pointed users to the same mitigations, it’s possible that EdgeSpot has identified a new variant of CVE-2018-4993 and the previously published PoC can be easily adapted. SecurityWeek has reached out to EdgeSpot and Adobe for clarifications and will update this article if they respond.

The vulnerability patched on Tuesday in Flash Player, identified as CVE-2018-15978, is an out-of-bounds read bug that can lead to information disclosure. The issue affects the Windows, macOS, Linux and Chrome OS versions of Flash Player, but Adobe does not expect to see it being exploited any time soon.

Advertisement. Scroll to continue reading.

Finally, Adobe has released updates for the Windows and macOS versions of Photoshop CC to address an out-of-bounds read bug that can lead to information disclosure. The vulnerability was reported to the tech giant by an anonymous researcher via Trend Micro’s Zero Day Initiative (ZDI).

Adobe says there is no evidence that any of these vulnerabilities have been exploited for malicious purposes.

Earlier this month, researchers warned that malicious actors had been exploiting a recently patched Adobe ColdFusion vulnerability to hack websites.

UPDATE. EdgeSpot has published a blog post confirming that the new Acrobat vulnerability (CVE-2018-15979) exists because Adobe failed to properly patch the flaw discovered earlier by Check Point (CVE-2018-4993).

Related: Adobe Patches Vulnerabilities in Flash Player, ColdFusion

Related: Adobe Patches Flash Zero-Day Exploited in Targeted Attacks

Related: Over 100 Vulnerabilities Patched in Adobe Acrobat, Reader

Written By

Eduard Kovacs (@EduardKovacs) is a contributing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.

Click to comment

Daily Briefing Newsletter

Subscribe to the SecurityWeek Email Briefing to stay informed on the latest threats, trends, and technology, along with insightful columns from industry experts.

SecurityWeek’s Threat Detection and Incident Response Summit brings together security practitioners from around the world to share war stories on breaches, APT attacks and threat intelligence.


Securityweek’s CISO Forum will address issues and challenges that are top of mind for today’s security leaders and what the future looks like as chief defenders of the enterprise.


Expert Insights

Related Content


Less than a week after announcing that it would suspended service indefinitely due to a conflict with an (at the time) unnamed security researcher...

Data Breaches

OpenAI has confirmed a ChatGPT data breach on the same day a security firm reported seeing the use of a component affected by an...

Risk Management

The supply chain threat is directly linked to attack surface management, but the supply chain must be known and understood before it can be...


The latest Chrome update brings patches for eight vulnerabilities, including seven reported by external researchers.


Patch Tuesday: Microsoft warns vulnerability (CVE-2023-23397) could lead to exploitation before an email is viewed in the Preview Pane.


Apple has released updates for macOS, iOS and Safari and they all include a WebKit patch for a zero-day vulnerability tracked as CVE-2023-23529.

IoT Security

A group of seven security researchers have discovered numerous vulnerabilities in vehicles from 16 car makers, including bugs that allowed them to control car...

Application Security

Drupal released updates that resolve four vulnerabilities in Drupal core and three plugins.