USN-1642-1: Lynx vulnerabilities

Ubuntu Security Notice USN-1642-1

29th November, 2012

lynx-cur vulnerabilities

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

  • Ubuntu 12.10
  • Ubuntu 12.04 LTS
  • Ubuntu 11.10
  • Ubuntu 10.04 LTS

Summary

Two security issues were fixed in Lynx.

Software description

  • lynx-cur - Text-mode WWW Browser with NLS support

Details

Dan Rosenberg discovered a heap-based buffer overflow in Lynx. If a user
were tricked into opening a specially crafted page, a remote attacker could
cause a denial of service via application crash, or possibly execute
arbitrary code as the user invoking the program. This issue only affected
Ubuntu 10.04 LTS. (CVE-2010-2810)

It was discovered that Lynx did not properly verify that an HTTPS
certificate was signed by a trusted certificate authority. This could allow
an attacker to perform a "man in the middle" (MITM) attack which would make
the user believe their connection is secure, but is actually being
monitored. This update changes the behavior of Lynx such that self-signed
certificates no longer validate. Users requiring the previous behavior can
use the 'FORCE_SSL_PROMPT' option in lynx.cfg. (CVE-2012-5821)

Update instructions

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

Ubuntu 12.10:
lynx-cur 2.8.8dev.12-2ubuntu0.1
Ubuntu 12.04 LTS:
lynx-cur 2.8.8dev.9-2ubuntu0.12.04.1
Ubuntu 11.10:
lynx-cur 2.8.8dev.9-2ubuntu0.11.10.1
Ubuntu 10.04 LTS:
lynx-cur 2.8.8dev.2-1ubuntu0.1

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

In general, a standard system update will make all the necessary changes.

References

CVE-2010-2810, CVE-2012-5821