Buffer overflow in the CA-driver (dst_ca.c) for TwinHan DST Frontend/Card in Linux kernel 2.6.12 and other versions before 2.6.15 allows local users to cause a denial of service (crash) and possibly execute arbitrary code by "reading more than 8 bytes into an 8 byte long array".

A number of vulnerabilities were discovered and corrected in the Linux 2.6 kernel :

The udp_v6_get_port function in udp.c, when running IPv6, allows local users to cause a Denial of Service (infinite loop and crash) (CVE-2005-2973).

The mq_open system call in certain situations can decrement a counter twice as a result of multiple calls to the mntput function when the dentry_open function call fails, allowing a local user to cause a DoS (panic) via unspecified attack vectors (CVE-2005-3356).

The procfs code allows attackers to read sensitive kernel memory via unspecified vectors in which a signed value is added to an unsigned value (CVE-2005-4605).

A buffer overflow in sysctl allows local users to cause a DoS and possibly execute arbitrary code via a long string, which causes sysctl to write a zero byte outside the buffer (CVE-2005-4618).

A buffer overflow in the CA-driver for TwinHan DST Frontend/Card allows local users to cause a DoS (crash) and possibly execute arbitrary code by reading more than eight bytes into an eight byte long array (CVE-2005-4639).

dm-crypt does not clear a structure before it is freed, which leads to a memory disclosure that could allow local users to obtain sensitive information about a cryptographic key (CVE-2006-0095).

Remote attackers can cause a DoS via unknown attack vectors related to an 'extra dst release when ip_options_echo fails' in icmp.c (CVE-2006-0454).

In addition to these security fixes, other fixes have been included such as :

  - support for mptsas

    - fix for IPv6 with sis190

    - a problem with the time progressing twice as fast

    - a fix for Audigy 2 ZS Video Editor sample rates

    - a fix for a supermount crash when accessing a       supermount-ed CD/DVD drive

  - a fix for improperly unloading sbp2 module

The provided packages are patched to fix these vulnerabilities. All users are encouraged to upgrade to these updated kernels.

To update your kernel, please follow the directions located at :

http://www.mandriva.com/en/security/kernelupdate

Doug Chapman discovered a flaw in the reference counting in the sys_mq_open() function. By calling this function in a special way, a local attacker could exploit this to cause a kernel crash.
(CVE-2005-3356)

Karl Janmar discovered that the /proc file system module used signed data types in a wrong way. A local attacker could exploit this to read random kernel memory, which could possibly contain sensitive data like passwords or private keys. (CVE-2005-4605)

Yi Yang discovered an off-by-one buffer overflow in the sysctl() system call. By calling sysctl with a specially crafted long string, a local attacker could exploit this to crash the kernel or possibly even execute arbitrary code with full kernel privileges. (CVE-2005-4618)

Perceval Anichini found a buffer overflow in the TwinHan DST Frontend/Card DVB driver. A local user could exploit this to crash the kernel or possibly execute arbitrary code with full kernel privileges.
This only affects Ubuntu 5.10. (CVE-2005-4639)

Stefan Rompf discovered that the dm-crypt module did not clear memory structures before releasing the memory allocation of it. This could lead to the disclosure of encryption keys. (CVE-2006-0095)

The SDLA WAN driver did not restrict firmware upgrades to processes that have the CAP_SYS_RAWIO kernel capability, it just required the CAP_NET_ADMIN privilege. This could allow processes with the latter privilege to update the SDLA firmware. Please note that this does not affect a standard Ubuntu installation, and this cannot be exploited by a normal (unprivileged) user. At most, this flaw might be relevant for installations that use a fine-grained capability granting system like RSBAC, cap_over, or grsecurity. This only affects Ubuntu 4.10.
(CVE-2006-0096).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
20939	Mandrake Linux Security Advisory : kernel (MDKSA-2006:040)	Nessus	Mandriva Local Security Checks	medium
20791	Ubuntu 4.10 / 5.04 / 5.10 : linux-source-2.6.8.1/-2.6.10/-2.6.12 vulnerabilities (USN-244-1)	Nessus	Ubuntu Local Security Checks	high

Detections

Analytics

CVE-2005-4639

high

Tenable Plugins

medium

high