[Linux-bruxelles] Faille ds OpenSSL et petit ver...

[Philippe Teuwen]

On l'a annoncé il y a peu sur Debian security:
qqs failles ds les libs OpenSSL.
Plus inquiétant est cet article qui fait état
de "milliers" de serveurs Apache infectés par un
ver qui utilise ces vulnérabilités.

Pour vérifier si votre serveur a été touché:
Identifying infected hosts
http://www.cert.org/advisories/CA-2002-27.html

Ouf! apparemment il est pas passé chez moi...
Phil

Slapper worm spanks Apache servers
http://www.theregister.co.uk/content/55/27134.html


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Debian Security Advisory DSA-136-2                   security at debian.org
http://www.debian.org/security/                            Michael Stone
September 15, 2002                    http://www.debian.org/security/faq
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Package        : openssl094, openssl095, openssl
Problem type   : multiple remote exploits
Debian-specific: no
CVE            : CAN-2002-0655 CAN-2002-0656 CAN-2002-0657 CAN-2002-0659

Note: this advisory is an update to DSA-136-1, issued 30 Jul 2002. It
includes ASN1 updates in the woody packages, plus the potato packages
which were not initially available.

The OpenSSL development team has announced that a security audit by A.L.
Digital Ltd and The Bunker, under the DARPA CHATS program, has revealed
remotely exploitable buffer overflow conditions in the OpenSSL code.
Additionaly, the ASN1 parser in OpenSSL has a potential DoS attack
independently discovered by Adi Stav and James Yonan.

CAN-2002-0655 references overflows in buffers used to hold ASCII
representations of integers on 64 bit platforms. CAN-2002-0656
references buffer overflows in the SSL2 server implementation (by
sending an invalid key to the server) and the SSL3 client implementation
(by sending a large session id to the client). The SSL2 issue was also
noticed by Neohapsis, who have privately demonstrated exploit code for
this issue. CAN-2002-0659 references the ASN1 parser DoS issue.

These vulnerabilities have been addressed for Debian 3.0 (woody) in
openssl094_0.9.4-6.woody.1, openssl095_0.9.5a-6.woody.1 and
openssl_0.9.6c-2.woody.1.

These vulnerabilities are also present in Debian 2.2 (potato). Fixed
packages are available in openssl094_0.9.4-6.potato.0 and
openssl_0.9.6c-0.potato.4.

Only i386 packages for openssl094 and openssl095 are available at this
time; other architectures will be made available as soon as possible.

A worm is actively exploiting this issue on internet-attached hosts;
we recommend you upgrade your OpenSSL as soon as possible. Note that you
must restart any daemons using SSL. (E.g., ssh or ssl-enabled apache.)
If you are uncertain which programs are using SSL you may choose to
reboot to ensure that all running daemons are using the new libraries.

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