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CVE-2023-38488— Kirby vulnerable to field injection in the KirbyData text storage handler

Quick assessment

Affected
getkirby kirby
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.

Kirby是一套基于文件的内容管理系统（CMS）。 Kirby 3.5.8.2版本及之前版本、3.6.0到3.6.6.2版本 、3.7.0到3.7.5.1版本、3.8.0到3.8.4版本、3.9.0到3.9.5版本存在安全漏洞，该漏洞源于允许外部访问者更新 Kirby 内容文件。

CVSS 7.1 · High EPSS 0.92% · P59

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-38488

Vulnerability Information
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Vulnerability Title
Kirby vulnerable to field injection in the KirbyData text storage handler
Source: CVE Program / CVE List V5
Vulnerability Description
Kirby is a content management system. A vulnerability in versions prior to 3.5.8.3, 3.6.6.3, 3.7.5.2, 3.8.4.1, and 3.9.6 affects all Kirby sites that might have potential attackers in the group of authenticated Panel users or that allow external visitors to update a Kirby content file (e.g. via a contact or comment form). Kirby sites are *not* affected if they don't allow write access for untrusted users or visitors. A field injection in a content storage implementation is a type of vulnerability that allows attackers with content write access to overwrite content fields that the site developer didn't intend to be modified. In a Kirby site this can be used to alter site content, break site behavior or inject malicious data or code. The exact security risk depends on the field type and usage. Kirby stores content of the site, of pages, files and users in text files by default. The text files use Kirby's KirbyData format where each field is separated by newlines and a line with four dashes (`----`). When reading a KirbyData file, the affected code first removed the Unicode BOM sequence from the file contents and afterwards split the content into fields by the field separator. When writing to a KirbyData file, field separators in field data are escaped to prevent user input from interfering with the field structure. However this escaping could be tricked by including a Unicode BOM sequence in a field separator (e.g. `--\xEF\xBB\xBF--`). When writing, this was not detected as a separator, but because the BOM was removed during reading, it could be abused by attackers to inject other field data into content files. Because each field can only be defined once per content file, this vulnerability only affects fields in the content file that were defined above the vulnerable user-writable field or not at all. Fields that are defined below the vulnerable field override the injected field content and were therefore already protected. The problem has been patched in Kirby 3.5.8.3, 3.6.6.3, 3.7.5.2, 3.8.4.1, and 3.9.6. In all of the mentioned releases, the maintainers have fixed the affected code to only remove the Unicode BOM sequence at the beginning of the file. This fixes this vulnerability both for newly written as well as for existing content files.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
分隔符转义处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Kirby 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kirby是一套基于文件的内容管理系统（CMS）。 Kirby 3.5.8.2版本及之前版本、3.6.0到3.6.6.2版本 、3.7.0到3.7.5.1版本、3.8.0到3.8.4版本、3.9.0到3.9.5版本存在安全漏洞，该漏洞源于允许外部访问者更新 Kirby 内容文件。
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
getkirby kirby < 3.5.8.3 -

II. Public POCs for CVE-2023-38488

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8214 chars
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III. Intelligence Information for CVE-2023-38488

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Patches & Fixes for CVE-2023-38488 (1)

Vendor Advisories for CVE-2023-38488 (1)

Other References for CVE-2023-38488 (5)

Same Patch Batch · getkirby · 2023-07-27 · 5 CVEs total

CVE-2023-38489 7.3 HIGH Kirby vulnerable to Insufficient Session Expiration after a password change
CVE-2023-38490 6.8 MEDIUM Kirby XML External Entity (XXE) vulnerability in the XML data handler
CVE-2023-38491 5.7 MEDIUM Kirby vulnerable to Cross-site scripting (XSS) from MIME type auto-detection of uploaded f
CVE-2023-38492 5.3 MEDIUM Kirby vulnerable to denial of service from unlimited password lengths

IV. Related Vulnerabilities

Same product: kirby
Same vendor: getkirby
Same weakness: CWE-140

V. Comments for CVE-2023-38488

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