Stories with Tag CVE

• Next.js version 15.2.3 has been released to address a security vulnerability

  permalink

  Posted: 2025-03-22 21:19:07

  Verbose tl;dr

  Next.js 15.2.3 patches a high-severity security vulnerability (CVE-2025-29927) that could allow attackers to execute arbitrary code on servers running affected versions. The vulnerability stems from improper handling of serialized data within the Image component when using a custom loader. Upgrading to 15.2.3 or later is strongly recommended for all users. Versions 13.4.15 and 14.9.5 also address the issue for older release lines.

  The Next.js development team has released version 15.2.3 of their popular React framework to specifically address a recently discovered security vulnerability, identified as CVE-2025-29927. This vulnerability affects all Next.js versions prior to 15.2.3, including the widely used version 13.

  The core issue lies within the next/image component and its handling of remote images, particularly those using the loader prop. If a developer utilized a custom loader function within their next/image component and this function directly incorporated user-provided input without proper sanitization or validation, it opened a potential avenue for a Cross-Site Scripting (XSS) attack. An attacker could craft a malicious URL designed to inject arbitrary JavaScript code into the application. This injected code would then execute within the context of the affected user's browser, potentially allowing the attacker to steal sensitive information like cookies, session tokens, or other user data, manipulate the application's functionality, or redirect the user to a malicious website.

  The vulnerability is explicitly categorized as an XSS (Cross-Site Scripting) vulnerability. It does not stem from an inherent flaw within Next.js itself, but rather from the potential misuse of the loader prop's flexibility. Essentially, the framework provides a powerful tool, but its safe usage requires developers to implement robust input validation and sanitization practices.

  The Next.js team strongly urges all users to upgrade to version 15.2.3 immediately to mitigate this vulnerability. The fix implemented in 15.2.3 centers around enhancing the security within the next/image component to prevent the execution of unsanitized user-provided input. While the exact details of the implementation haven't been explicitly detailed in the announcement, it likely involves internal sanitization or stricter validation of the data passed to custom loader functions.

  For those who cannot immediately upgrade to 15.2.3, the team recommends thoroughly reviewing and auditing any custom loader functions used within their next/image components to ensure they are not susceptible to this vulnerability. Specifically, developers should validate and sanitize any user-supplied data that gets incorporated into the loader function's URL construction to prevent the injection of malicious JavaScript code.

  This proactive release and transparent communication from the Next.js team underscores the importance of security in web development and the continuous need to address potential vulnerabilities to protect users and applications.

  • Next.js
  • Security
  • Vulnerability
  • release
  • CVE
  • cve-2025-29927
  • version 15
  • javascript
  • Web Development
  • Frontend
  • React
  • Server-Side Rendering
  • SSR

  Summary of Comments ( 123 )
  https://news.ycombinator.com/item?id=43448723

  Verbose tl;dr

  Hacker News commenters generally express relief and gratitude for the swift patch addressing the vulnerability in Next.js 15.2.3. Some questioned the severity and real-world exploitability of the vulnerability given the limited information disclosed, with one suggesting the high CVE score might be precautionary. Others discussed the need for better communication from Vercel, including details about the nature of the vulnerability and its potential impact. A few commenters also debated the merits of using older, potentially more stable, versions of Next.js versus staying on the cutting edge. Some users expressed frustration with the constant stream of updates and vulnerabilities in modern web frameworks.

  The Hacker News post discussing the Next.js security vulnerability (CVE-2025-29927) and the subsequent release of version 15.2.3 generated several comments. Many commenters express relief and gratitude towards the Next.js team for their swift action in addressing the issue. Several note the professional handling of the situation, appreciating the clear communication and quick patch.

  A few comments delve into the technical aspects of the vulnerability, discussing how malicious actors might exploit it to gain control of a server's terminal. One commenter specifically mentions the potential for attackers to execute commands using the vulnerable next-server CLI. Others highlight the importance of promptly updating to the patched version to mitigate the risk.

  Some commenters express concern over the potential impact of this vulnerability, given the popularity of Next.js. They discuss the wider implications for the JavaScript ecosystem and the importance of security best practices.

  A few commenters also discuss the challenges of maintaining security in complex software projects. They acknowledge the difficulty of catching such vulnerabilities before release and emphasize the importance of ongoing security audits and vulnerability disclosure programs.

  One commenter asks about the specifics of how the vulnerability was discovered and whether a bug bounty was involved. Another commenter notes the responsible disclosure process followed by the Next.js team.

  Several comments thread also contain discussions comparing this vulnerability to others and discussing the relative severity of the vulnerability and the effectiveness of the patch.

• Rsync vulnerabilities

  permalink

  Posted: 2025-01-15 02:45:54

  Verbose tl;dr

  Multiple vulnerabilities were discovered in rsync, a widely used file synchronization tool. These vulnerabilities affect both the client and server components and could allow remote attackers to execute arbitrary code or cause a denial of service. Exploitation generally requires a malicious rsync server, though a malicious client could exploit a vulnerable server with pre-existing trust, such as a backup server. Users are strongly encouraged to update to rsync version 3.2.8 or later to address these vulnerabilities.

  The Openwall OSS-Security mailing list post details multiple vulnerabilities discovered in rsync, a widely used utility for file synchronization. These vulnerabilities affect both the server (rsyncd) and client components.

  The most critical vulnerability, CVE-2023-23930, is a heap-based buffer overflow in the name_to_gid() function. This flaw allows an authenticated user with write access to a module to trigger the overflow through a specially crafted module name when connecting to an rsync server. Successful exploitation could lead to arbitrary code execution with the privileges of the rsync daemon, typically root. This vulnerability impacts rsync versions 3.2.7 and earlier.

  Another vulnerability, CVE-2023-23931, is an integer overflow within the read_varint() function. This vulnerability can lead to a heap-based buffer overflow when handling specially crafted data during the initial handshake between the rsync client and server. This flaw can be triggered by an unauthenticated attacker, allowing potential remote code execution as the user running the rsync daemon. This affects rsync versions 3.2.4 and earlier. Due to specifics in the exploit, it is more easily exploitable on 32-bit architectures. While impacting both client and server, exploitation requires connecting a malicious client to a vulnerable server or a vulnerable client connecting to a malicious server.

  A further vulnerability, CVE-2024-0543, allows unauthenticated remote users to cause a denial-of-service (DoS) condition. This is achieved by sending a large number of invalid requests to the rsync server. This DoS vulnerability affects rsync versions from 3.0.0 up to and including 3.7.0. The impact is specifically on the server component, rsyncd. While not as severe as remote code execution, this can disrupt service availability.

  Finally, CVE-2024-0545 is a heap out-of-bounds write vulnerability in the rsync client, specifically during the file list transfer phase. An attacker could potentially exploit this by providing a malicious file list, which, when processed by a vulnerable client, could lead to a crash or potentially to arbitrary code execution. This affects versions from 3.0.0 up to and including 3.7.0. Unlike the other vulnerabilities primarily affecting the server, this one targets the client connecting to a potentially malicious server.

  In summary, these vulnerabilities range in severity from denial of service to remote code execution. They highlight the importance of updating rsync installations to the latest patched versions to mitigate the risks posed by these flaws. Both client and server components are susceptible, requiring careful consideration of the attack vectors and potential impact on different system architectures.

  • rsync
  • Security
  • Vulnerability
  • CVE
  • remote code execution
  • file transfer
  • network security
  • Linux
  • unix
  • Open Source
  • oss-security
  • arbitrary file write
  • information disclosure

  Summary of Comments ( 8 )
  https://news.ycombinator.com/item?id=42706732

  Verbose tl;dr

  Hacker News users discussed the disclosed rsync vulnerabilities, primarily focusing on the practical impact. Several commenters downplayed the severity, noting the limited exploitability due to the requirement of a compromised rsync server or a malicious client connecting to a user's server. Some highlighted the importance of SSH as a secure transport layer, mitigating the risk for most users. The conversation also touched upon the complexities of patching embedded systems and the potential for increased scrutiny of rsync's codebase following these disclosures. A few users expressed concern over the lack of memory safety in C, suggesting it as a contributing factor to such vulnerabilities.

  The Hacker News post titled "Rsync vulnerabilities" (https://news.ycombinator.com/item?id=42706732) has several comments discussing the disclosed vulnerabilities in rsync. Many commenters express concern over the severity of these vulnerabilities, particularly CVE-2024-25915, which is described as a heap-based buffer overflow. This vulnerability is seen as potentially serious due to the widespread use of rsync and the possibility of remote code execution.

  Several comments highlight the importance of updating rsync installations promptly. One user points out the specific versions affected and emphasizes the need to upgrade to a patched version. Another commenter expresses surprise that rsync, a mature and widely used tool, still contains such vulnerabilities.

  A recurring theme in the comments is the complexity of patching rsync, particularly in larger deployments. One user describes the challenge of patching numerous embedded systems running rsync. Another commenter mentions potential disruptions to automated processes and expresses concern about unforeseen consequences.

  The discussion also touches on the history of rsync security and the fact that similar vulnerabilities have been found in the past. This leads some commenters to speculate about the underlying causes of these issues and to suggest improvements to the development and auditing processes.

  Several users share their experiences with rsync and its alternatives. Some commenters recommend specific tools or approaches for managing file synchronization and backups. Others discuss the trade-offs between security, performance, and ease of use.

  Some technical details about the vulnerabilities are also discussed, including the specific conditions required for exploitation and the potential impact on different systems. One commenter explains the concept of heap overflows and the risks associated with them. Another commenter describes the mitigation strategies implemented in the patched versions.

  Overall, the comments reflect a mixture of concern, pragmatism, and technical analysis. Many users express the need for vigilance and proactive patching, while also acknowledging the practical challenges involved. The discussion highlights the importance of responsible disclosure and the ongoing efforts to improve the security of widely used software.