Gentoo: GLSA-201408-14: stunnel: Information disclosure
Summary
stunnel does not properly update the state of the pseudo-random generator after fork-threading which causes subsequent children with the same process ID to use the same entropy pool. ECDSA and DSA keys, when not used in deterministic mode (RFC6979), rely on random data for its k parameter to not leak private key information.
Resolution
All stunnel users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/stunnel-5.02"
References
[ 1 ] CVE-2014-0016 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-0016
Availability
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
https://security.gentoo.org/glsa/201408-14
Concerns
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.
Synopsis
A vulnerability in stunnel might allow remote attackers to gain access to private key information.
Background
The stunnel program is designed to work as an SSL encryption wrapper between a client and a local or remote server.
Affected Packages
------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-misc/stunnel < 5.02 >= 5.02
Impact
===== A remote attacker may gain access to private key information from ECDSA or DSA keys.
Workaround
There is no known workaround at this time.