It was discovered that Lasso, a library for Liberty Alliance and SAML protocols performs incorrect validation of the return value of OpenSSL's DSA_verify() function.
For the stable distribution (etch), this problem has been fixed in version 0.6.5-3+etch1.
For the upcoming stable distribution (lenny) and the unstable distribution (sid), this problem has been fixed in version 2.2.1-2.
We recommend that you upgrade your lasso package.
MD5 checksums of the listed files are available in the original advisory.