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libpng mehrere Denial of Service Sicherheitslücken Advisory Available in English  Advisory Available in Danish 

Secunia Advisory: SA27093  
Herausgegeben: 2007-10-08
Last Update: 2007-10-09

Gefahrenstufe:
Weniger kritisch
Auswirkung: DoS
Von Wo: Aus dem Internet
Lösungsstatus: Hersteller-Patch

Software:libpng 1.x

CVE reference:CVE-2007-5268 (Secunia mirror)
CVE-2007-5269 (Secunia mirror)

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Beschreibung:
Einige Sicherheitslücken wurden in libpng gemeldet, die böswillige Personen ausnutzen können, um einen DoS (Denial of Service) zu verursachen.

1) Bestimmte Fehler in libpng, darunter die Verwendung eines logischen NOT anstelle eines bitweisen NOT in pngtrtran.c, ein Fehler in der "16bit cheap transparency extension" und die fehlerhafte Benutzung von sizeof() können ausgenutzt werden, um eine Anwendung, welche diese Bibliothek verwendet, zum Absturz zu bringen.

2) Verschiedene Out-Of-Bounds-Lesefehler existieren in den Funktionen "png_handle_pCAL()", "png_handle_sCAL()", "png_push_read_tEXt()", "png_handle_iTXt()" und "png_handle_ztXt()", welche ausgenutzt werden können, um eine Anwendung, welche diese Bibliothek verwendet, zum Absturz zu bringen.

Die Sicherheitslücken sind in Versionen vor 1.2.21 gemeldet.

Lösung:
Aktualisieren Sie auf Version 1.2.21.

Gemeldet und/oder entdeckt von:
1) George Cook und Jeff Phillips
2) Tavis Ormandy

Änderungen:
2007-10-09: CVE-Referenz hinzugefügt.

Original Advisory:
http://www.libpng.org/pub/png/libpng.html
http://sourceforge.net/mailarchive/fo....net&forum_name=png-mng-implement



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

4 Related Secunia Security Advisories

1. libpng Sicherheitslücke durch Verarbeitung von unbekannten Chunks
2. libpng ICC-Profil-Chunk Denial of Service Sicherheitslücke
3. libpng tRNS-Chunk Denial of Service
4. libpng Verarbeitung von "sPLT-Chunks" Denial of Service


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