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CVE-2023-6246— Glibc: heap-based buffer overflow in __vsyslog_internal()

Quick assessment

Affected
n/a glibc
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

glibc（GNU C Library）是GNU计划所实现的C标准库。 glibc 2.36及之前版本存在缓冲区错误漏洞，该漏洞源于存在基于堆的缓冲区溢出，从而导致应用程序崩溃或本地权限提升。

CVSS 8.4 · High EPSS 4.79% · P92

Affected Version Matrix 8

VendorProduct Version RangeStatus
Fedora Fedora any affected
n/a glibc 2.39 unaffected
Red Hat Red Hat Enterprise Linux 6 any unaffected
any unaffected
Red Hat Red Hat Enterprise Linux 7 any unaffected
any unaffected
Red Hat Red Hat Enterprise Linux 8 any unaffected
Red Hat Red Hat Enterprise Linux 9 any unaffected
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I. Basic Information for CVE-2023-6246

Vulnerability Information
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Vulnerability Title
Glibc: heap-based buffer overflow in __vsyslog_internal()
Source: CVE Program / CVE List V5
Vulnerability Description
A heap-based buffer overflow was found in the __vsyslog_internal function of the glibc library. This function is called by the syslog and vsyslog functions. This issue occurs when the openlog function was not called, or called with the ident argument set to NULL, and the program name (the basename of argv[0]) is bigger than 1024 bytes, resulting in an application crash or local privilege escalation. This issue affects glibc 2.36 and newer.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
glibc 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
glibc（GNU C Library）是GNU计划所实现的C标准库。 glibc 2.36及之前版本存在缓冲区错误漏洞，该漏洞源于存在基于堆的缓冲区溢出，从而导致应用程序崩溃或本地权限提升。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- glibc 2.39 -
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Fedora Fedora - -

II. Public POCs for CVE-2023-6246

# POC Description Source Link Shenlong Link
1 None https://github.com/elpe-pinillo/CVE-2023-6246 POC Details
2 A heap-based buffer overflow was found in the __vsyslog_internal function of the glibc library. This function is called by the syslog and vsyslog functions. This issue occurs when the openlog function was not called, or called with the ident argument set to NULL, and the program name (the basename of argv[0]) is bigger than 1024 bytes, resulting in an application crash or local privilege escalation. This issue affects glibc 2.36 and newer. https://github.com/projectdiscovery/nuclei-templates/blob/main/code/cves/2023/CVE-2023-6246.yaml POC Details
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III. Intelligence Information for CVE-2023-6246

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Vendor Advisories for CVE-2023-6246 (3)

Exploits & Public PoCs for CVE-2023-6246 (1)

Mailing List Discussions for CVE-2023-6246 (4)

Other References for CVE-2023-6246 (1)

Same Patch Batch · n/a · 2024-01-31 · 17 CVEs total

CVE-2023-6779 8.2 HIGH Glibc: off-by-one heap-based buffer overflow in __vsyslog_internal()
CVE-2024-1117 7.3 HIGH openBI Screen.php index code injection
CVE-2024-1116 7.3 HIGH openBI Upload.php index unrestricted upload
CVE-2024-1115 7.3 HIGH openBI Setting.php dlfile os command injection
CVE-2024-1114 6.5 MEDIUM openBI Screen.php dlfile access control
CVE-2023-2439 6.4 MEDIUM WordPress plugin UserPro 安全漏洞
CVE-2024-1113 6.3 MEDIUM openBI Unity.php uploadUnity unrestricted upload
CVE-2023-6780 5.3 MEDIUM Glibc: integer overflow in __vsyslog_internal()
CVE-2024-1098 4.3 MEDIUM Rebuild proxy-download QiniuCloud.getStorageFile information disclosure
CVE-2024-1099 3.5 LOW Rebuild read-raw getFileOfData cross site scripting
CVE-2024-23745 Notion Web Clipper 安全漏洞
CVE-2024-22569 POSCMS 安全漏洞
CVE-2023-31505 Schlix CMS 安全漏洞
CVE-2024-23170 Mbed TLS 安全漏洞
CVE-2024-23775 Mbed TLS 安全漏洞
CVE-2022-47072 编号已被CVE保留

IV. Related Vulnerabilities

Same product: glibc
Same vendor: n/a
Same weakness: CWE-122

V. Comments for CVE-2023-6246

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