Ubuntu 11.10: USN-1424-1 Moderate OpenSSL Denial Of Service Attack

ubuntu

April 19, 2012

An application using OpenSSL could be made to crash or run programs if it opened a specially crafted file.

Summary

An application using OpenSSL could be made to crash or run programs if it

opened a specially crafted file.

Software Description:

- openssl: Secure Socket Layer (SSL) cryptographic library and tools

Details:

It was discovered that OpenSSL could be made to dereference a NULL pointer

when processing S/MIME messages. A remote attacker could use this to cause

a denial of service. These issues did not affect Ubuntu 8.04 LTS.

(CVE-2006-7250, CVE-2012-1165)

Tavis Ormandy discovered that OpenSSL did not properly perform bounds

checking when processing DER data via BIO or FILE functions. A remote

attacker could trigger this flaw in services that used SSL to cause a

denial of service or possibly execute arbitrary code with application

privileges. (CVE-2012-2110)

Topics Covered

security advisory denial of service remote attack Ubuntu OpenSSL

Update Instructions

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

Ubuntu 11.10:
  libssl1.0.0                     1.0.0e-2ubuntu4.4

Ubuntu 11.04:
  libssl0.9.8                     0.9.8o-5ubuntu1.4

Ubuntu 10.04 LTS:
  libssl0.9.8                     0.9.8k-7ubuntu8.10

Ubuntu 8.04 LTS:
  libssl0.9.8                     0.9.8g-4ubuntu3.17

After a standard system update you need to reboot your computer to make
all the necessary changes.