||OpenSSL 0.9.6e uses assertions when detecting buffer overflow attacks instead of less severe mechanisms, which allows remote attackers to cause a denial of service (crash) via certain messages that cause OpenSSL to abort from a failed assertion, as demonstrated using SSLv2 CLIENT_MASTER_KEY messages, which are not properly handled in s2_srvr.c.
|Base: ||5.0 (as of 01-01-2004 - 00:00)|
|NASL family||Web Servers |
|NASL id||OPENSSL_0_9_6F.NASL |
|description||According to its banner, the remote server is running a version of
OpenSSL that is earlier than 0.9.6f.
A remote attacker can trigger a denial of service by sending a
specially crafted SSLv2 CLIENT_MASTER_KEY message. |
|last seen||2019-01-16 |
|plugin id||17747 |
|title||OpenSSL < 0.9.6f Denial of Service |
|NASL family||Red Hat Local Security Checks |
|NASL id||REDHAT-RHSA-2002-157.NASL |
|description||Updated OpenSSL packages are available which fix several serious
buffer overflow vulnerabilities.
OpenSSL is a commercial-grade, full-featured, and Open Source toolkit
which implements the Secure Sockets Layer (SSL v2/v3) and Transport
Layer Security (TLS v1) protocols as well as a full-strength general
purpose cryptography library. A security audit of the OpenSSL code
sponsored by DARPA found several buffer overflows in OpenSSL which
affect versions 0.9.7 and 0.9.6d and earlier :
1. The master key supplied by a client to an SSL version 2 server
could be oversized, causing a stack-based buffer overflow. This issue
is remotely exploitable. Services that have SSLv2 disabled would not
be vulnerable to this issue. (CVE-2002-0656)
2. The SSLv3 session ID supplied to a client from a malicious server
could be oversized and overrun a buffer. This issue looks to be
remotely exploitable. (CVE-2002-0656)
3. Various buffers used for storing ASCII representations of integers
were too small on 64 bit platforms. This issue may be exploitable.
A further issue was found in OpenSSL 0.9.7 that does not affect
versions of OpenSSL shipped with Red Hat Linux (CVE-2002-0657).
A large number of applications within Red Hat Linux make use the
OpenSSL library to provide SSL support. All users are therefore
advised to upgrade to the errata OpenSSL packages, which contain
patches to correct these vulnerabilities.
Please read the Solution section below as it contains instructions for
making sure that all SSL-enabled processes are restarted after the
update is applied.
Thanks go to the OpenSSL team and Ben Laurie for providing patches for
these issues. |
|last seen||2019-01-16 |
|plugin id||12315 |
|title||RHEL 2.1 : openssl (RHSA-2002:157) |
|Last major update
||17-10-2016 - 22:27
||17-11-2003 - 00:00