J-Security Center

Title: Vixie Cron crontab Privilege Lowering Failure Vulnerability

Severity: MODERATE

Description:

Vixie cron is an implementation of the popular UNIX program that runs user-specified programs at periodic scheduled times.

A serialization error exists in some versions of the crontab file maintenance program. The vulnerability was introduced in versions which were patched for seperate vulnerability in fall of 2000 (see Bugtraq ID #1960).

When a parsing error occurs after a modification operation, crontab will fail to drop privileges correctly for subsequent modification operations. Because the program is installed setuid root, it may be possible for a local user to gain root privileges.

Affected Products:

  • Conectiva Linux 6.0.0
  • Conectiva Linux 7.0.0
  • Conectiva Linux 8.0.0
  • Debian Linux 2.2.0
  • Debian Linux 2.2.0 68k
  • Debian Linux 2.2.0 alpha
  • Debian Linux 2.2.0 arm
  • Debian Linux 2.2.0 powerpc
  • Debian Linux 2.2.0 sparc
  • Paul Vixie Vixie Cron 3.0.0pl1
  • Paul Vixie Vixie Cron 3.0.1
  • Progeny Debian 1.0.0
  • S.u.S.E. Linux 7.1.0
  • S.u.S.E. Linux 7.1.0 ppc
  • S.u.S.E. Linux 7.1.0 sparc
  • S.u.S.E. Linux 7.1.0 x86

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