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CVE-2023-6918— Libssh: missing checks for return values for digests

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 8
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libssh是libssh组织的一个用于访问SSH服务的C语言开发包，它能够执行远程命令、文件传输，同时为远程的程序提供安全的传输通道。 libssh存在安全漏洞，该漏洞源于返回值未得到正确检查，可能会导致内存不足、NULL指针取消引用、崩溃或使用未初始化的内存。

CVSS 3.7 · Low EPSS 1.41% · P72

Possible ATT&CK Techniques 1 AI

T1562.008
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I. Basic Information for CVE-2023-6918

Vulnerability Information
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Vulnerability Title
Libssh: missing checks for return values for digests
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the libssh implements abstract layer for message digest (MD) operations implemented by different supported crypto backends. The return values from these were not properly checked, which could cause low-memory situations failures, NULL dereferences, crashes, or usage of the uninitialized memory as an input for the KDF. In this case, non-matching keys will result in decryption/integrity failures, terminating the connection.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加检查的返回值
Source: CVE Program / CVE List V5
Vulnerability Title
libssh 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libssh是libssh组织的一个用于访问SSH服务的C语言开发包，它能够执行远程命令、文件传输，同时为远程的程序提供安全的传输通道。 libssh存在安全漏洞，该漏洞源于返回值未得到正确检查，可能会导致内存不足、NULL指针取消引用、崩溃或使用未初始化的内存。
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
Red Hat Red Hat Enterprise Linux 8 0:0.9.6-14.el8 ~ * cpe:/o:redhat:enterprise_linux:8::baseos
Red Hat Red Hat Enterprise Linux 8 0:0.9.6-14.el8 ~ * cpe:/o:redhat:enterprise_linux:8::baseos
Red Hat Red Hat Enterprise Linux 9 0:0.10.4-13.el9 ~ * cpe:/o:redhat:enterprise_linux:9::baseos
Red Hat Red Hat Enterprise Linux 9 0:0.10.4-13.el9 ~ * cpe:/o:redhat:enterprise_linux:9::baseos
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

II. Public POCs for CVE-2023-6918

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III. Intelligence Information for CVE-2023-6918

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Vendor Advisories for CVE-2023-6918 (4)

Mailing List Discussions for CVE-2023-6918 (2)

Other References for CVE-2023-6918 (2)

Same Patch Batch · Red Hat · 2023-12-18 · 10 CVEs total

CVE-2023-4320 7.6 HIGH Satellite: arithmetic overflow in satellite
CVE-2023-5384 7.2 HIGH Infinispan: credentials returned from configuration as clear text
CVE-2023-5056 6.8 MEDIUM Skupper-operator: privelege escalation via config map
CVE-2023-3628 6.5 MEDIUM Infispan: rest bulk ops don't check permissions
CVE-2023-5115 6.3 MEDIUM Ansible: malicious role archive can cause ansible-galaxy to overwrite arbitrary files
CVE-2023-6927 4.6 MEDIUM Keycloak: open redirect via "form_post.jwt" jarm response mode
CVE-2023-5236 4.4 MEDIUM Infinispan: circular reference on marshalling leads to dos
CVE-2023-3629 4.3 MEDIUM Infinispan: non-admins should not be able to get cache config via rest api
CVE-2023-6228 3.3 LOW Libtiff: heap-based buffer overflow in cpstriptotile() in tools/tiffcp.c

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 8
Same vendor: Red Hat
Same weakness: CWE-252

V. Comments for CVE-2023-6918

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