https://feed.craftedsignal.io/tags/integer_overflow/Trending threats, MITRE ATT&CK coverage, and detection metadata — refreshed continuously.Hugoenhello@craftedsignal.iohello@craftedsignal.ioFri, 01 May 2026 22:16:16 +0000https://feed.craftedsignal.io/briefs/2026-05-libssh2-overflow/Fri, 01 May 2026 22:16:16 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2026-05-libssh2-overflow/An integer overflow vulnerability exists in libssh2 versions up to 1.11.1 within the userauth_password function of src/userauth.c, which can be triggered remotely by manipulating username_len/password_len arguments.A remote integer overflow vulnerability has been identified in libssh2, a library implementing the SSH2 protocol. The vulnerability affects versions up to and including 1.11.1. The root cause lies in the userauth_password function within the src/userauth.c file. By manipulating the username_len and password_len arguments, an attacker can trigger an integer overflow. Successful exploitation could lead to denial of service or potentially remote code execution. The patch to address this vulnerability is identified as 256d04b60d80bf1190e96b0ad1e91b2174d744b1. Defenders should apply this patch to mitigate the risk.

Attack Chain

1. Attacker identifies a vulnerable libssh2 server or application.
2. Attacker initiates an SSH connection to the target.
3. The client begins the SSH authentication process.
4. The attacker crafts a malicious SSH password authentication request.
5. The request includes specially crafted username_len and password_len values designed to cause an integer overflow in the userauth_password function.
6. The userauth_password function processes the malicious lengths, resulting in an integer overflow.
7. The overflow leads to memory corruption or other unexpected behavior.
8. The corrupted memory can be exploited to cause a denial-of-service condition, or potentially, remote code execution.

Impact

Successful exploitation of this vulnerability could lead to a denial-of-service condition, disrupting services relying on the affected libssh2 library. In more severe scenarios, remote code execution might be possible, granting the attacker control over the affected system. While specific victim counts are unavailable, any system using a vulnerable version of libssh2 is potentially at risk.

Recommendation

• Apply the patch identified as 256d04b60d80bf1190e96b0ad1e91b2174d744b1 to remediate the integer overflow vulnerability.
• Deploy the Sigma rule “Detect libssh2 Integer Overflow Attempt” to identify potential exploitation attempts (see below).
• Monitor network traffic for unusually large username or password lengths during SSH authentication to detect suspicious activity.
• Upgrade to a version of libssh2 later than 1.11.1.

]]>mediumadvisorycveinteger_overflowlibssh2https://feed.craftedsignal.io/briefs/2024-01-25-cve-2026-3229/Thu, 25 Jan 2024 17:00:00 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2024-01-25-cve-2026-3229/CVE-2026-3229 is an integer overflow vulnerability in certificate chain allocation affecting a Microsoft product, potentially leading to denial of service or arbitrary code execution.CVE-2026-3229 is an integer overflow vulnerability within a Microsoft product related to certificate chain allocation. An attacker could potentially exploit this vulnerability to cause a denial-of-service condition or, in more severe scenarios, achieve arbitrary code execution on a vulnerable system. The specific product affected is not detailed in the provided source, but the vulnerability lies in how the product handles certificate chain allocation. The attack likely involves crafting a malicious certificate chain that, when processed by the vulnerable software, triggers the integer overflow. This could lead to memory corruption and, ultimately, a crash or code execution. Defenders should monitor for exploitation attempts targeting certificate processing functions within Microsoft products.

Attack Chain

1. Attacker crafts a malicious certificate chain specifically designed to trigger an integer overflow during allocation.
2. The attacker delivers the crafted certificate chain to the targeted system. This could be achieved through various methods, such as embedding the certificate in a network request.
3. The vulnerable Microsoft product attempts to process the certificate chain.
4. During the certificate chain processing, the software calculates the required memory allocation size based on the provided certificates.
5. The calculation results in an integer overflow, leading to a smaller-than-expected memory allocation.
6. The software copies the certificate chain data into the undersized memory buffer.
7. This memory corruption leads to a denial-of-service condition or, potentially, allows the attacker to overwrite adjacent memory regions.
8. If the attacker gains control of overwritten memory, they can potentially inject and execute arbitrary code on the system.

Impact

Successful exploitation of CVE-2026-3229 can lead to a denial-of-service condition, disrupting the availability of the affected Microsoft product. In more severe cases, an attacker can achieve arbitrary code execution, allowing them to gain control over the compromised system. The number of potential victims is dependent on the vulnerable product’s deployment scale. Sectors reliant on the affected Microsoft product may experience service disruptions and data breaches.

Recommendation

• Monitor process creation events for unexpected processes spawned by the vulnerable Microsoft product after certificate processing (process_creation).
• Deploy the provided Sigma rule to detect potential exploitation attempts based on abnormal memory allocation patterns (see “Detect Suspicious Memory Allocation” rule).
• Analyze network traffic for suspicious certificate exchanges involving unusually large or malformed certificates.

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