It was reported [1] that Konqueror in KDE 4.4.0 through to and including 4.6.1 is vulnerable to a partially universal XSS in error pages. When Konqueror cannot fetch a requested URL, it renders an error page that contains the given URL. If the URL were to contain JavaScript or HTML code, the code is also rendered which could allow for a user to be tricked into visiting a malicious web site or to provide credentials to an untrusted party.

Patches are available for the 4.4, 4.5, and 4.6 branches, linked to from the upstream security advisory.

[1] http://www.kde.org/info/security/advisory-20110411-1.txt

Cross-site scripting (XSS) vulnerability in webkitpart.cpp in kwebkitpart allows remote attackers to inject arbitrary web script or HTML via a URL associated with a nonexistent domain name, related to a "universal XSS" issue, a similar vulnerability to CVE-2010-2536.

Common Vulnerabilities and Exposures assigned an identifier of CVE-2009-1725 to the following vulnerability:

KDE Konqueror allows remote attackers to cause a denial of service and potentially execute arbitrary code via a buffer overflow due to improper handling of numeric character references. This issue was first discovered in WebKit and fixed in KHTML (trunk, 4.3 branch and 3.5 branch) a few hours ago: http://websvn.kde.org/?view=rev&revision=1002162 http://websvn.kde.org/?view=rev&revision=1002163 http://websvn.kde.org/?view=rev&revision=1002164

I am already working on Fedora updates.

KDE Konqueror allows remote attackers to cause a denial of service (memory consumption) via a large integer value for the length property of a Select object, a related issue to CVE-2009-1692.

The HTML parser in KDE Konqueror 3.5.9 allows remote attackers to cause a denial of service (application crash) via (1) a long COLOR attribute in an HR element; or a long (a) BGCOLOR or (b) BORDERCOLOR attribute in a (2) TABLE, (3) TD, or (4) TR element. NOTE: the FONT vector is already covered by CVE-2008-4514.

The HTML parser in KDE Konqueror 3.5.9 allows remote attackers to cause a denial of service (application crash) via a font tag with a long color value, which triggers an assertion error.

Konqueror in KDE 3.5.9 allows remote attackers to cause a denial of service (application crash) via Javascript that calls the alert function with a URL-encoded string of a large number of invalid characters.

KDE Konqueror 3.5.5 and 3.95.00, when a user accepts an SSL server certificate on the basis of the CN domain name in the DN field, regards the certificate as also accepted for all domain names in subjectAltName:dNSName fields, even though these fields cannot be examined in the product, which makes it easier for remote attackers to trick a user into accepting an invalid certificate for a spoofed web site.

KDE Konqueror 3.5.6 and earlier allows remote attackers to cause a denial of service (crash) via large HTTP cookie parameters.

Unspecified vulnerability in KDE Konqueror 3.5.7 and earlier allows remote attackers to cause a denial of service (failed assertion and application crash) via certain malformed HTML, as demonstrated by a document containing TEXTAREA, BUTTON, BR, BDO, PRE, FRAMESET, and A tags. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.

Visual truncation vulnerability in KDE Konqueror 3.5.7 allows remote attackers to spoof the URL address bar via an http URI with a large amount of whitespace in the user/password portion.

KDE Konqueror 3.5.7 allows remote attackers to spoof the URL address bar by calling setInterval with a small interval and changing the window.location property.

konqueror/konqcombo.cc in Konqueror 3.5.7 allows remote attackers to spoof the data: URI scheme in the address bar via a long URI with trailing whitespace, which prevents the beginning of the URI from being displayed.

Visual truncation vulnerability in Konqueror 3.5.5 allows remote attackers to spoof the address bar and possibly conduct phishing attacks via a long hostname, which is truncated after a certain number of characters, as demonstrated by a phishing attack using HTTP Basic Authentication.

Konqueror 3.5.5 release 45.4 allows remote attackers to cause a denial of service (browser crash or abort) via JavaScript that matches a regular expression against a long string, as demonstrated using /(.)/.

Konqueror 3.5.5 allows remote attackers to cause a denial of service (crash) by using JavaScript to read a child iframe having an ftp:// URI.

The FTP protocol implementation in Konqueror 3.5.5 allows remote servers to force the client to connect to other servers, perform a proxied port scan, or obtain sensitive information by specifying an alternate server address in an FTP PASV response.

ecma/kjshtml.cpp in KDE JavaScript (KJS), as used in Konqueror in KDE 3.5.5, allows remote attackers to cause a denial of service (crash) by accessing the content of an iframe with an ftp:// URI in the src attribute, probably due to a NULL pointer dereference.

The KDE HTML library (kdelibs), as used by Konqueror 3.5.5, does not properly parse HTML comments, which allows remote attackers to conduct cross-site scripting (XSS) attacks and bypass some XSS protection schemes by embedding certain HTML tags within a comment in a title tag, a related issue to CVE-2007-0478.

KDE Konqueror 3.5.1 and earlier allows remote attackers to cause a denial of service (application crash) by calling the replaceChild method on a DOM object, which triggers a null dereference, as demonstrated by calling document.replaceChild with a 0 (zero) argument.

Konqueror can associate a cookie with multiple domains when the DNS resolver has a non-root domain in its search list, which allows remote attackers to trick a user into accepting a cookie for a hostname formed via search-list expansion of the hostname entered by the user, or steal a cookie for an expanded hostname, as demonstrated by an attacker who operates an ap1.com Internet web site to steal cookies associated with an ap1.com.example.com intranet web site.

KDE Konqueror does not prevent cookies that are sent over an insecure channel (HTTP) from also being sent over a secure channel (HTTPS/SSL) in the same domain, which could allow remote attackers to steal cookies and conduct unauthorized activities, aka "Cross Security Boundary Cookie Injection."

Konqueror 3.1.3, 3.2.2, and possibly other versions does not properly prevent a frame in one domain from injecting content into a frame that belongs to another domain, which facilitates web site spoofing and other attacks, aka the frame injection vulnerability.

KDE Konqueror 2.1.1 and 2.2.2 allows remote attackers to spoof a legitimate URL in the status bar via A HREF tags with modified "alt" values that point to the legitimate site, combined with an image map whose href points to the malicious site, which facilitates a "phishing" attack.

The URI handlers in Konqueror for KDE 3.2.2 and earlier do not properly filter "-" characters that begin a hostname in a (1) telnet, (2) rlogin, (3) ssh, or (4) mailto URI, which allows remote attackers to manipulate the options that are passed to the associated programs, possibly to read arbitrary files or execute arbitrary code.

Konqueror in KDE 3.0.3 allows remote attackers to cause a denial of service (core dump) via a web page that begins with a "xFFxFE" byte sequence and a large number of CRLF sequences, as demonstrated using freeze.htm.