MolotovCherry - CraftedSignal Threat Feed

Android-ImageMagick7 Out-of-Bounds Write Vulnerability (CVE-2026-4756)

hello@craftedsignal.io — Wed, 03 Jan 2024 12:00:00 +0000

CVE-2026-4756 is an out-of-bounds write vulnerability present in MolotovCherry's Android-ImageMagick7 library. Specifically, versions prior to 7.1.2-11 are affected. This vulnerability could allow a malicious actor to write data outside the intended memory buffer while processing image files. Successful exploitation could potentially lead to arbitrary code execution on the affected Android device. Given the widespread use of Android devices, and the potential for exploitation via malicious image files, this is a significant vulnerability for defenders to be aware of and mitigate. The vulnerability was reported by the Government Technology Agency of Singapore Cyber Security Group (GovTech CSG).

Attack Chain

The attacker crafts a specially crafted image file designed to trigger the out-of-bounds write in Android-ImageMagick7.
The victim downloads or receives the malicious image file (e.g., via MMS, email, or a malicious website).
An application on the Android device (e.g., an image viewer, a social media app, or even the operating system itself) uses the vulnerable Android-ImageMagick7 library to process the image.
During image processing, the vulnerability is triggered, leading to an out-of-bounds write to memory.
The attacker overwrites critical data structures in memory, potentially including function pointers or other executable code.
The attacker gains control of the program execution flow by manipulating the overwritten memory.
The attacker injects and executes arbitrary code on the device.
The attacker achieves persistence, exfiltrates sensitive data, or performs other malicious activities.

Impact

Successful exploitation of CVE-2026-4756 can lead to arbitrary code execution on the affected Android device. This could allow an attacker to gain full control of the device, steal sensitive data (e.g., contacts, photos, financial information), install malware, or use the device as part of a botnet. The impact is significant due to the widespread use of Android devices and the potential for exploitation via common communication channels like MMS and email. A successful widespread attack could compromise a large number of devices.

Recommendation

Upgrade Android-ImageMagick7 to version 7.1.2-11 or later to patch CVE-2026-4756.
Monitor application logs for errors related to image processing with Android-ImageMagick7 that could indicate exploitation attempts (reference application logging).
Implement runtime protections such as address space layout randomization (ASLR) and data execution prevention (DEP) to make exploitation more difficult.
Consider using a mobile threat detection solution that can identify and block malicious image files.

Android-ImageMagick7 Memory Leak Vulnerability (CVE-2026-33856)

hello@craftedsignal.io — Tue, 02 Jan 2024 12:00:00 +0000

CVE-2026-33856 describes a memory leak vulnerability affecting MolotovCherry Android-ImageMagick7 versions prior to 7.1.2-11. This vulnerability, classified as a Missing Release of Memory after Effective Lifetime (CWE-401), could be exploited by a malicious actor to cause a denial-of-service condition. The vulnerability resides within the Android-ImageMagick7 library, a port of ImageMagick to the Android platform. An attacker could potentially trigger the memory leak by submitting crafted image files for processing, exhausting available memory resources, and ultimately crashing the application or device. Defenders should prioritize patching vulnerable versions of Android-ImageMagick7.

Attack Chain

Attacker crafts a malicious image file specifically designed to trigger the memory leak in Android-ImageMagick7.
The attacker deploys the malicious image to a web server or other publicly accessible location.
A user downloads an application that utilizes the vulnerable Android-ImageMagick7 library.
The user visits a website or opens an application that loads the attacker's crafted image file using Android-ImageMagick7.
Android-ImageMagick7 processes the image file, allocating memory for image operations.
Due to the vulnerability (CWE-401), the allocated memory is not properly released after it's no longer needed, leading to a memory leak.
Repeated processing of similar malicious images progressively consumes available memory.
The system eventually runs out of memory, causing the application to crash or the entire Android device to become unresponsive (Denial of Service).

Impact

Successful exploitation of CVE-2026-33856 can lead to a denial-of-service condition on affected Android devices. While the provided information doesn't specify the number of victims or targeted sectors, the impact is significant for applications relying on Android-ImageMagick7 for image processing. An attacker could potentially disrupt services and cause data loss due to application crashes.

Recommendation

Upgrade Android-ImageMagick7 to version 7.1.2-11 or later to remediate CVE-2026-33856 (reference: CVE-2026-33856).
Monitor applications that use Android-ImageMagick7 for excessive memory consumption that could indicate exploitation of this vulnerability.
Deploy the Sigma rules below to detect suspicious process creation related to image processing that may indicate exploitation.
Implement input validation on image files processed by Android-ImageMagick7 to prevent processing of maliciously crafted files.

Android-ImageMagick7 Improper Input Validation Vulnerability (CVE-2026-4755)

hello@craftedsignal.io — Tue, 02 Jan 2024 10:00:00 +0000

A critical vulnerability, CVE-2026-4755, has been identified in MolotovCherry Android-ImageMagick7. This vulnerability, classified as CWE-20 (Improper Input Validation), affects versions prior to 7.1.2-11. The vulnerability allows for remote unauthenticated attackers to cause a denial of service, or potentially remote code execution. The issue stems from a failure to properly validate user-supplied input, which could lead to unexpected behavior or memory corruption within the application. Successful exploitation of this vulnerability could have severe consequences, including the compromise of sensitive data or complete system takeover. The Government Technology Agency of Singapore Cyber Security Group (GovTech CSG) reported this vulnerability.

Attack Chain

Attacker crafts a malicious image with specially crafted metadata or pixel data.
The attacker hosts the malicious image on a web server or delivers it via email/messaging.
The user downloads or receives the malicious image on their Android device.
The Android device uses Android-ImageMagick7 to process the image (e.g., displaying the image in a gallery app, using it as an avatar, or processing it in a third-party application that relies on the library).
Android-ImageMagick7 fails to properly validate the malicious image data.
Due to the improper input validation, the application may crash, enter an infinite loop, or execute arbitrary code injected by the attacker.
If code execution is achieved, the attacker can gain control of the application's context and potentially escalate privileges on the Android device.
The attacker can then access sensitive data, install malware, or perform other malicious activities.

Impact

Successful exploitation of CVE-2026-4755 can have significant repercussions. An attacker could potentially achieve remote code execution, gaining unauthorized access to sensitive data, or even compromising the entire Android device. Given the widespread use of Android-ImageMagick7, a successful exploit could impact a large number of users across various sectors. If the vulnerable application is a core system component, exploitation may result in complete device compromise.

Recommendation

Upgrade Android-ImageMagick7 to version 7.1.2-11 or later to patch CVE-2026-4755.
Monitor application logs for error messages related to image processing, which could indicate exploitation attempts. Deploy the Sigma rule "Detect Suspicious ImageMagick Error Messages" to identify potential exploitation attempts based on log patterns.
Implement input validation and sanitization measures in applications that use Android-ImageMagick7 to mitigate the risk of exploitation, as the root cause is improper input validation (CWE-20).