ep's blog

MySQL OpenSSL Server Certificate yaSSL Security Bypass Vulnerability


"MySQL is prone to a security-bypass vulnerability.

An attacker can exploit this issue to bypass certain security
restrictions and obtain sensitive information that may lead to further

Versions prior to MySQL 5.1.41 are vulnerable."

It is recommended to update to the latest version of MySQL as soon as

ClamAV Prior to 0.95.2 Multiple Scanner Bypass Vulnerabilities


"ClamAV is prone to multiple vulnerabilities because it fails to
properly restrict certain files after scanning them.

A successful attack may allow malicious users to bypass security
restrictions placed on certain files. Exploits may aid in further attacks.

Versions prior to ClamAv 0.95.2 are vulnerable."

It is recommended to update ClamAv to the latest version.

Reflections on Cybersecurity from Science Magazine


Science Magazine published this reflection on Cybersecurity in the November 13 issue of their magazine.  It goes over some great topics in security, such as Defense in Depth and the concerns of not protecting the inside of your network.

I agree with the major points of the article and think it is a good read.

Thanks to Momota for passing the article my way.


TLS / SSLv3 renegotiation vulnerability explained

Back in September, a vulnerability in the way we encrypt was found and quietly discussed in the security community.  It was a vulnerability that would allow malicious attackers to inject data into an encrypted conversation, thus breaking the integrity of the conversation.  When the vulnerability became public in October and mainstream in November, there was a lot of confusion about what was vulnerable, and what the risk was in using this type of encryption.

G-Sec from Luxemburg wrote this paper describing the issue in detail.

Linux Kernel KVM 'KVM_MAX_MCE_BANKS' Memory Corruption Vulnerability


The Linux kernel is prone to a memory-corruption vulnerability that
affects the Kernel-based Virtual Machine (KVM).

Local attackers can exploit this issue to execute arbitrary code with
superuser privileges. Successful exploits will completely compromise
affected computers.

Versions prior to Linux kernel 2.6.32-rc7 are vulnerable. "

It is recommended to update the kernel on affected systems.

Microsoft Excel Index Parsing Remote Code Execution Vulnerability


"Microsoft Excel is prone to a remote code-execution vulnerability.

Attackers can exploit this issue by enticing victims into opening a
specially crafted Excel ('.xls') file.

Successful exploits can allow attackers to execute arbitrary code with
the privileges of the user running the application. "

WordPress < 2.8.6 Arbitrary File Upload Vulnerability


"WordPress is prone to a vulnerability that lets attackers upload
arbitrary files. The issue occurs because the application fails to
adequately sanitize user-supplied input.

An attacker can exploit this vulnerability to upload arbitrary code and
run it in the context of the webserver process. This may facilitate
unauthorized access or privilege escalation; other attacks are also

TLS Man in the Middle (MITM) attacks based on renegotiation - patches available for RHEL3,4,5


A recent paper on TLS renegotiation showed a method for injecting
information into the encrypted stream. This could lead to successful
Man in the Middle (MITM) attacks in an already encrypted stream.

The current mitigation patch that is officially supported by RedHat is
to totally disable encryption re-negotiation. This workaround has been
patched in OpenSSL 0.9.8l.

Autocomplete Data Theft in Mozilla Firefox


"A malicious web page can extract out all the data stored within the
autocomplete history of a user's Firefox browser. The web page must
convince a user to hold down the left or right-arrow keys then the
contents of the autocomplete popup can be read. This may includes the
search history box within the browser, or other personal details."

"Mozilla fixed this issue in the 3.5.4 and releases of Firefox."