CVE-2013-4347

Advisory

Oauth2 1.9 includes a fix for CVE-2013-4347: It was found that python-oauth2 did not properly generate random values for use in nonces. An attacker able to capture network traffic of a website using OAuth2 authentication could use this flaw to conduct replay attacks against that website.
https://github.com/joestump/python-oauth2/commit/82dd2cdd4954cd7b8983d5d64c0dfd9072bf4650

Affected package

Affected versions

Fixed versions

Vulnerability changelog

The (1) make_nonce, (2) generate_nonce, and (3) generate_verifier functions in SimpleGeo python-oauth2 uses weak random numbers to generate nonces, which makes it easier for remote attackers to guess the nonce via a brute force attack.


MLIST:[oss-security] 20130912 Re: cve requests for python-oauth2: http://www.openwall.com/lists/oss-security/2013/09/12/7
MISC:https://github.com/simplegeo/python-oauth2/issues/9: https://github.com/simplegeo/python-oauth2/issues/9
MISC:https://github.com/simplegeo/python-oauth2/pull/146: https://github.com/simplegeo/python-oauth2/pull/146
BID:62388: http://www.securityfocus.com/bid/62388

Resources

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-4347
• https://github.com/simplegeo/python-oauth2/issues/9
• https://github.com/simplegeo/python-oauth2/pull/146
• http://www.openwall.com/lists/oss-security/2013/09/12/7
• http://www.securityfocus.com/bid/62388