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Home >> Browse Vulnerability Assessment Database >> Gentoo Local Security Checks >> [GLSA-200403-03] Multiple OpenSSL Vulnerabilities


Vulnerability Assessment Details

[GLSA-200403-03] Multiple OpenSSL Vulnerabilities

Vulnerability Assessment Summary
Multiple OpenSSL Vulnerabilities

Detailed Explanation for this Vulnerability Assessment
The remote host is affected by the vulnerability described in GLSA-200403-03
(Multiple OpenSSL Vulnerabilities)


Testing performed by the OpenSSL group using the Codenomicon
TLS Test Tool uncovered a null-pointer assignment in the
do_change_cipher_spec() function. A remote attacker could perform
a carefully crafted SSL/TLS handshake against a server that used
the OpenSSL library in such a way as to cause OpenSSL to
crash. Depending on the application this could lead to a denial of
service. All versions of OpenSSL from 0.9.6c to 0.9.6l inclusive
and from 0.9.7a to 0.9.7c inclusive are affected by this issue.
A flaw has been discovered in SSL/TLS handshaking code when
using Kerberos ciphersuites. A remote attacker could perform a
carefully crafted SSL/TLS handshake against a server configured to
use Kerberos ciphersuites in such a way as to cause OpenSSL to
crash. Most applications have no ability to use Kerberos
cipher suites and will therefore be unaffected. Versions 0.9.7a,
0.9.7b, and 0.9.7c of OpenSSL are affected by this issue.
Testing performed by the OpenSSL group using the Codenomicon
TLS Test Tool uncovered a bug in older versions of OpenSSL 0.9.6
that can lead to a Denial of Service attack (infinite
loop). This issue was traced to a fix that was added to OpenSSL
0.9.6d some time ago. This issue will affect vendors that ship
older versions of OpenSSL with backported security patches.

Impact

Although there are no public exploits known for bug, users are recommended
to upgrade to ensure the security of their infrastructure.

Workaround

There is no immediate workaround
a software upgrade is required. The
vulnerable function in the code has been rewritten.


Solution:
All users are recommened to upgrade openssl to either 0.9.7d or 0.9.6m:
# emerge sync
# emerge -pv ">=dev-libs/openssl-0.9.7d"
# emerge ">=dev-libs/openssl-0.9.7d"


Network Security Threat Level: Medium


Networks Security ID:

Vulnerability Assessment Copyright: (C) 2005 Michel Arboi

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