Bug 20785

Summary:	CVE-2009-0217 XML signature HMAC truncation authentication bypass
Product:	Sisyphus	Reporter:	Vladimir Lettiev <crux>
Component:	libxmlsec1	Assignee:	Fr. Br. George <george>
Status:	CLOSED WONTFIX	QA Contact:	qa-sisyphus
Severity:	normal
Priority:	P3	CC:	andy, george, mike
Version:	unstable	Keywords:	security
Hardware:	all
OS:	Linux
URL:	http://www.kb.cert.org/vuls/id/466161

Description

Vladimir Lettiev 2009-07-15 15:05:36 MSD

XML Signature Syntax and Processing (XMLDsig) is a W3C recommendation for providing integrity, message authentication, and/or signer authentication services for data. XMLDsig is commonly used by web services such as SOAP. The XMLDsig recommendation includes support for HMAC truncation, as specified in RFC2014. When HMAC truncation is under the control of an attacker, however, this can result in an effective authentication bypass. For example, by specifying an HMACOutputLength of 1, only one bit of the signature is verified. This can allow an attacker to forge an XML signature that will be accepted as valid.

fixed in 1.2.12

Comment 1

Michael Shigorin 2011-09-10 10:52:20 MSK

В сизифе такого пакета уже нет; последний бранч (с 1.2.10) -- 5.0:
4.0/SRPMS/xmlsec1-1.2.10-alt1.src.rpm
4.1/SRPMS/xmlsec1-1.2.10-alt1.src.rpm
5.0/SRPMS/xmlsec1-1.2.10-alt1.1.src.rpm