The MITRE CVE dictionary describes this issue as:
** DISPUTED ** M2Crypto does not properly check the return value from the OpenSSL EVP_VerifyFinal, DSA_verify, ECDSA_verify, DSA_do_verify, and ECDSA_do_verify functions, which might allow remote attackers to bypass validation of the certificate chain via a malformed SSL/TLS signature, a similar vulnerability to CVE-2008-5077. NOTE: a Linux vendor disputes the relevance of this report to the M2Crypto product because "these functions are not used anywhere in m2crypto."
Find out more about CVE-2009-0127 from the
MITRE CVE dictionary dictionary and
Red Hat does not consider this to be a security issue. M2Crypto provides python interfaces to multiple OpenSSL functions. Neither of those interfaces is further used by M2Crypto in an insecure way. Additionally, no application shipped in Red Hat Enterprise Linux is known to use affected interfaces provided by M2Crypto.
Further details can be found in the following bug report: https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2009-0127#c1