Ubuntu Security Notice USN-792-1

25th June, 2009

openssl vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

• Ubuntu 9.04
• Ubuntu 8.10
• Ubuntu 8.04 LTS
• Ubuntu 6.06 LTS

Software description

• openssl

Details

It was discovered that OpenSSL did not limit the number of DTLS records it
would buffer when they arrived with a future epoch. A remote attacker could
cause a denial of service via memory resource consumption by sending a
large number of crafted requests. (CVE-2009-1377)

It was discovered that OpenSSL did not properly free memory when processing
DTLS fragments. A remote attacker could cause a denial of service via
memory resource consumption by sending a large number of crafted requests.
(CVE-2009-1378)

It was discovered that OpenSSL did not properly handle certain server
certificates when processing DTLS packets. A remote DTLS server could cause
a denial of service by sending a message containing a specially crafted
server certificate. (CVE-2009-1379)

It was discovered that OpenSSL did not properly handle a DTLS
ChangeCipherSpec packet when it occured before ClientHello. A remote
attacker could cause a denial of service by sending a specially crafted
request. (CVE-2009-1386)

It was discovered that OpenSSL did not properly handle out of sequence
DTLS handshake messages. A remote attacker could cause a denial of service
by sending a specially crafted request. (CVE-2009-1387)

Update instructions

The problem can be corrected by updating your system to the following package version:

Ubuntu 9.04:

libssl0.9.8 0.9.8g-15ubuntu3.2

Ubuntu 8.10:

libssl0.9.8 0.9.8g-10.1ubuntu2.4

Ubuntu 8.04 LTS:

libssl0.9.8 0.9.8g-4ubuntu3.7

Ubuntu 6.06 LTS:

libssl0.9.8 0.9.8a-7ubuntu0.9

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system upgrade you need to reboot your computer to
effect the necessary changes.

References

CVE-2009-1377, CVE-2009-1378, CVE-2009-1379, CVE-2009-1386, CVE-2009-1387