Bug 20785

Summary: CVE-2009-0217 XML signature HMAC truncation authentication bypass
Product: Sisyphus Reporter: Vladimir Lettiev <crux>
Component: libxmlsec1Assignee: Fr. Br. George <george>
Status: CLOSED WONTFIX QA Contact: qa-sisyphus
Severity: normal    
Priority: P3 CC: andy, george, mike
Version: unstableKeywords: 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