[ GLSA 201408-14 ] stunnel: Information disclosure

[GLSA]

Gentoo Linux Security Advisory

Title: stunnel: Information disclosure (GLSA 201408-14)
Severity: normal
Exploitable: remote
Date: August 29, 2014
Bug(s): #503506
ID: 201408-14

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: net-misc/stunnel
Vulnerable: < 5.02
Unaffected: >= 5.02
Architectures: All supported architectures


Description

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.


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.

Resolution

All stunnel users should upgrade to the latest version: