3/9/2024 0 Comments Season 2 overflowThis scenario could result in a malloc() failure within qsort(), opening the door for exploitation. For an application to be vulnerable, it must utilize the qsort() function with a specific set of criteria: a nontransitive comparison function (such as a simple cmp(int a, int b) returning (a – b)) and a substantial number of elements controlled by an attacker. This issue arises from a missing bounds check, leading to memory corruption. The second vulnerability involves a subtle yet dangerous flaw in glibc’s qsort() function. Interestingly, a similar issue was reported in December 1997 in an older Linux libc version. Although the vulnerability requires specific conditions to be exploited (such as an unusually long argv or openlog() ident argument), its impact is significant due to the widespread use of the affected library. The buffer overflow issue, traced back to the introduction of glibc version 2.37, poses a significant threat as it could allow local privilege escalation, enabling an unprivileged user to gain full root access through crafted inputs to applications that employ these logging functions. This critical function underpins the widely-used syslog() and vsyslog() functions. This vulnerability identified is a heap-based buffer overflow within the _vsyslog_internal() function of the GNU C Library, also known as glibc. Heap-Based Buffer Overflow in _vsyslog_internal() Function (CVE-2023-6246): These flaws highlight the critical need for strict security measures in software development, especially for core libraries widely used across many systems and applications. Similarly, the qsort vulnerability, stemming from a missing bounds check, can lead to memory corruption and has affected all glibc versions since 1992. The syslog vulnerability, a heap-based buffer overflow, can allow local users to gain full root access, impacting major Linux distributions. The discovery of vulnerabilities in the GNU C Library’s syslog and qsort functions raises major security concerns. This vulnerability can be triggered when qsort() is used with a nontransitive comparison function (such as cmp(int a, int b) returning (a – b)) and a large number of elements controlled by an attacker, potentially leading to a malloc() failure. Moving on to the last vulnerability, a memory corruption issue was found in the GNU C Library’s qsort () function, caused by missing bounds check. Additionally, exploiting them effectively is likely to be more complex. CVE-2023-6780 (glibc): This is an integer overflow issue in the _vsyslog_internal() function.īased on our assessment, triggering these vulnerabilities appears more challenging than CVE-2023-6246.CVE-2023-6779 (glibc): This vulnerability involves an off-by-one heap-based buffer overflow in the _vsyslog_internal() function.In our analysis of the same function affected by CVE-2023-6246, we identified two additional, albeit minor, vulnerabilities: This flaw allows local privilege escalation, enabling an unprivileged user to gain full root access, as demonstrated in Fedora 38. Major Linux distributions like Debian (versions 12 and 13), Ubuntu (23.04 and 23.10), and Fedora (37 to 39) are confirmed to be vulnerable. This heap-based buffer overflow vulnerability was inadvertently introduced in glibc 2.37 (August 2022) and subsequently backported to glibc 2.36 while addressing a different, less severe vulnerability (CVE-2022-39046). This article aims to shed light on the specific nature of these vulnerabilities, their potential impacts, and the steps taken to mitigate them.įor the first vulnerability (CVE-2023-6246), a significant security flaw has been identified in the GNU C Library’s _vsyslog_internal() function, affecting syslog() and vsyslog(). The ramifications of these vulnerabilities extend far beyond individual systems, affecting many applications and potentially millions of users worldwide. The vulnerabilities identified in glibc’s syslog and qsort functions highlight a critical aspect of software security: even the most foundational and trusted components are not immune to flaws. The recent discovery of these vulnerabilities is not just a technical concern but a matter of widespread security implications. The GNU C Library, or glibc, is an essential component of virtually every Linux-based system, serving as the core interface between applications and the Linux kernel. The Qualys Threat Research Unit (TRU) has recently unearthed four significant vulnerabilities in the GNU C Library, a cornerstone for countless applications in the Linux environment.īefore diving into the specific details of the vulnerabilities discovered by the Qualys Threat Research Unit in the GNU C Library, it’s crucial to understand these findings’ broader impact and importance.
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