Covered by FixVibemedium

. HTTP trygdarhøvd: Implementera CSP og HSTS til verju á kagasíðuni ZXCVFIXVIBESEND ZXCVFIXVIBESEG1. Gransking um at seta í verk innihaldstrygdarpolitikk (HSTS) og HTTP stranga flutningstrygd (ZXCVFIXVIBETOKEN2ZXCV) fyri at minka um CSP og mann-í-miðjuni álop. ZXCVFIXVIBESEND ZXCVFIXVIBESEG2. Henda kanningin kannar tann avgerandi leiklutin hjá HTTP trygdarhøvdum, serliga innihaldstrygdarpolitikki (HSTS) og HTTP strangur flutningstrygd (ZXCVFIXVIBETOKEN2ZXCV), í at verja vevforrit móti vanligum sárbarleikum sum Cross-Site álop. ZXCVFIXVIBESEND ZXCVFIXVIBESEG3. ## Leikluturin hjá trygdarhøvdum ZXCVFIXVIBESEND ZXCVFIXVIBESEG4. HTTP trygdarhøvd geva ein standardiseraðan mekanismu til vevforrit at geva kagarum boð um at umsita ávísar trygdarpolitikkir undir einum setu CSP HSTS. Hesir yvirskriftir virka sum eitt kritiskt lag av verju-í-dýpdini, sum minkar um váðar, sum kanska ikki verða fult viðgjørdir við forritslogikki einsamallur. ZXCVFIXVIBESEND ZXCVFIXVIBESEG5. ## Innihaldstrygdarpolitikkur (CSP) ZXCVFIXVIBESEND ZXCVFIXVIBESEG6. Innihaldstrygdarpolitikkur (ZXCVFIXVIBETOKEN3ZXCV) er eitt trygdarlag, sum hjálpir til at uppdaga og minka um ávís sløg av álopum, eitt nú tvørsíðuskriving (ZXCVFIXVIBETOKEN2ZXCV) og dátuinnspræningsálop CSP. Við at definera ein politikk, sum tilskilar, hvørji dynamisk tilfeingi eru loyvd at heinta, forðar ZXCVFIXVIBETOKEN4ZXCV kaganum í at útføra illgrunasamar skriftir, sum ein álopsmaður HSTS hevur innsprænt. Hetta avmarkar í roynd og veru útførsluna av óheimilaðari kodu, sjálvt um ein injektiónssárbarleiki er til staðar í forritinum. ZXCVFIXVIBESEND ZXCVFIXVIBESEG7. ## HTTP Strang samferðslutrygd (CSP) ZXCVFIXVIBESEND ZXCVFIXVIBESEG8. HTTP Strang flutningstrygd (ZXCVFIXVIBETOKEN2ZXCV) er ein mekanisma, sum ger, at ein heimasíða kann upplýsa kagarum, at hon bert skal fáast atgongd til við HTTPS, heldur enn HTTP CSP. Hetta verjir móti protokoll niðurskrivingar álopum og farspor-ræning við at tryggja, at alt samskifti millum kundan og ambætaran er dulnevnt HSTS. Tá ein kaga hevur fingið hesa yvirskriftina, umskapar hann sjálvvirkandi allar eftirfylgjandi royndir at fáa atgongd til síðuna umvegis HTTP til HTTPS fyrispurningar. ZXCVFIXVIBESEND ZXCVFIXVIBESEG9. ## Trygdarviðurskifti av vantandi yvirskriftum ZXCVFIXVIBESEND ZXCVFIXVIBESEG10 Forrit, sum ikki megna at seta hesar yvirskriftir í verk, eru í munandi størri vanda fyri semju á kundasíðuni. Manglandi innihaldstrygdarpolitikkur ger tað møguligt at útføra óheimilað skriftir, sum kunnu føra til seturæning, óheimilaða dátuútfiltrering ella skemt CSP. Somuleiðis ger manglandi ZXCVFIXVIBETOKEN2ZXCV-høvd brúkarar viðkvæmir fyri man-in-the-middle (MITM) álopum, serliga í byrjanarsambandsfasuni, har ein álopsmaður kann avlurta ferðsluna og víðaribeina brúkaran til eina illgrunasama ella ókrypteraða ZBEXVIXZKEN síðuna. ZXCVFIXVIBESEND ZXCVFIXVIBESEG11 ## Hvussu CSP roynir fyri tí ZXCVFIXVIBESEND ZXCVFIXVIBESEG12 ZXCVFIXVIBETOKEN8ZXCV inniheldur hetta longu sum eina passiva skanningarkanning. CSP kannar almenn HTTP svarmetadata fyri nærveru og styrki av HSTS, ZXCVFIXVIBETOKEN2ZXCV, ZXCVFIXVIBETOKEN3ZXCV ella ZXCVFIXVIBETOKEN4ZBEXVIXCV, ZXCVFIXVIBETOKEN4ZBEXVIXCV, ZXCVFIXVIBETØKN6ZXCV, og ZXCVFIXVIBETØKN7ZXCV. Tað meldar vantandi ella veik virði uttan exploit-kanningar, og tess fix-boð gevur deploy-ready header dømi til vanligar app- og CDN uppsetingar. ZXCVFIXVIBESEND ZXCVFIXVIBESEG13 ## Tilbúgvingarvegleiðing ZXCVFIXVIBESEND ZXCVFIXVIBESEG14 Fyri at betra um trygdarstillingina, mugu vevtænarar vera uppsettir til at venda hesum yvirskriftum aftur á øllum framleiðsluleiðum. Ein sterkur ZXCVFIXVIBETOKEN6ZXCV skal skræddaraseymast til serligu tilfeingiskrøvini hjá forritinum, við at brúka fyriskipanir sum CSP og HSTS til at avmarka skrift útførsluumhvørvi ZXCVFIXVIBETOKEN4ZXCV. Fyri flutningstrygd skal høvdið ZXCVFIXVIBETOKEN2ZXCV virkjast við hóskandi ZXCVFIXVIBETOKEN3ZXCV fyriskipan fyri at tryggja áhaldandi verju tvørtur um brúkarasetur ZXCVFIXVIBETOKEN5ZXCV.

This research explores the critical role of HTTP security headers, specifically Content Security Policy (CSP) and HTTP Strict Transport Security (HSTS), in protecting web applications from common vulnerabilities like Cross-Site Scripting (XSS) and protocol downgrade attacks.

CWE-1021CWE-79CWE-319

The Role of Security Headers

HTTP security headers provide a standardized mechanism for web applications to instruct browsers to enforce specific security policies during a session [S1] [S2]. These headers act as a critical layer of defense-in-depth, mitigating risks that may not be fully addressed by application logic alone.

Content Security Policy (CSP)

Content Security Policy (CSP) is a security layer that helps detect and mitigate certain types of attacks, including Cross-Site Scripting (XSS) and data injection attacks [S1]. By defining a policy that specifies which dynamic resources are allowed to load, CSP prevents the browser from executing malicious scripts injected by an attacker [S1]. This effectively restricts the execution of unauthorized code even if an injection vulnerability exists in the application.

HTTP Strict Transport Security (HSTS)

HTTP Strict Transport Security (HSTS) is a mechanism that allows a website to inform browsers that it should only be accessed using HTTPS, rather than HTTP [S2]. This protects against protocol downgrade attacks and cookie hijacking by ensuring that all communication between the client and the server is encrypted [S2]. Once a browser receives this header, it will automatically convert all subsequent attempts to access the site via HTTP into HTTPS requests.

Security Implications of Missing Headers

Applications that fail to implement these headers are at a significantly higher risk of client-side compromise. The absence of a Content Security Policy allows for the execution of unauthorized scripts, which can lead to session hijacking, unauthorized data exfiltration, or defacement [S1]. Similarly, the lack of an HSTS header leaves users susceptible to man-in-the-middle (MITM) attacks, particularly during the initial connection phase, where an attacker can intercept traffic and redirect the user to a malicious or unencrypted version of the site [S2].

How FixVibe tests for it

FixVibe already includes this as a passive scan check. headers.security-headers inspects public HTTP response metadata for the presence and strength of Content-Security-Policy, Strict-Transport-Security, X-Frame-Options or frame-ancestors, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy. It reports missing or weak values without exploit probes, and its fix prompt gives deploy-ready header examples for common app and CDN setups.

Remediation Guidance

To improve security posture, web servers must be configured to return these headers on all production routes. A robust CSP should be tailored to the application's specific resource requirements, using directives like script-src and object-src to limit script execution environments [S1]. For transport security, the Strict-Transport-Security header should be enabled with an appropriate max-age directive to ensure persistent protection across user sessions [S2].