CVE-2026-75870 : 詳細

CVE-2026-75870

2026-08-22
13h35 +00:00
2026-08-25
19h28 +00:00
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CVE の説明

Punk versions before 0.18 for Perl allow session cookie forgery via an empty default HMAC key when a session is declared without a secret

Punk versions before 0.18 for Perl allow session cookie forgery via an empty default HMAC key when a session is declared without a secret. The session keyword freezes its options onto the application as given: it does not require a secret, warn, or refuse to start when one is absent. The cookie read and the write-back both default that key to the empty string, so a declaration with no secret option, or with an undefined or empty one, signs and verifies with a zero-length HMAC-SHA256 key. An attacker who knows the cookie format can then mint one offline carrying any contents the session holds, such as a user identifier or a role. Nothing marks the misconfiguration at runtime: cookies are well formed and sessions round-trip as expected.

CVE の解決策

Upgrade to Punk 0.18 or later.

CVE の情報

関連する弱点

CWE-ID 弱点名 出典
CWE-1394 Use of Default Cryptographic Key
The product uses a default cryptographic key for potentially critical functionality.

参考資料