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Debian DSA-288-1 : openssl - several vulnerabilities
high Nessus Plugin ID 15125
Synopsis
The remote Debian host is missing a security-related update.Description
Researchers discovered two flaws in OpenSSL, a Secure Socket Layer (SSL) library and related cryptographic tools. Applications that are linked against this library are generally vulnerable to attacks that could leak the server's private key or make the encrypted session decryptable otherwise. The Common Vulnerabilities and Exposures (CVE) project identified the following vulnerabilities :CAN-2003-0147 OpenSSL does not use RSA blinding by default, which allows local and remote attackers to obtain the server's private key.
CAN-2003-0131 The SSL allows remote attackers to perform an unauthorized RSA private key operation that causes OpenSSL to leak information regarding the relationship between ciphertext and the associated plaintext.
Solution
Upgrade the openssl packages immediately and restart the applications that use OpenSSL.For the stable distribution (woody) these problems have been fixed in version 0.9.6c-2.woody.3.
For the old stable distribution (potato) these problems have been fixed in version 0.9.6c-0.potato.6.
Unfortunately, RSA blinding is not thread-safe and will cause failures for programs that use threads and OpenSSL such as stunnel. However, since the proposed fix would change the binary interface (ABI), programs that are dynamically linked against OpenSSL won't run anymore. This is a dilemma we can't solve.
You will have to decide whether you want the security update which is not thread-safe and recompile all applications that apparently fail after the upgrade, or fetch the additional source packages at the end of this advisory, recompile it and use a thread-safe OpenSSL library again, but also recompile all applications that make use of it (such as apache-ssl, mod_ssl, ssh etc.).
However, since only very few packages use threads and link against the OpenSSL library most users will be able to use packages from this update without any problems.
See Also
Plugin Details
Severity: High
ID: 15125
File Name: debian_DSA-288.nasl
Version: 1.26
Type: local
Agent: unix
Family: Debian Local Security Checks
Published: 9/29/2004
Updated: 1/4/2021
Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.7
CVSS v2
Risk Factor: High
Base Score: 7.5
Temporal Score: 5.5
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P
Vulnerability Information
CPE: p-cpe:/a:debian:debian_linux:openssl, cpe:/o:debian:debian_linux:2.2, cpe:/o:debian:debian_linux:3.0
Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l
Exploit Ease: No known exploits are available
Patch Publication Date: 4/17/2003
Vulnerability Publication Date: 3/19/2003
Reference Information
CVE: CVE-2003-0131, CVE-2003-0147
CERT: 888801
DSA: 288