ypbind printf() format string
| ypbind-printf-format-string (5394) |  High Risk |
Description:
The ypbind daemon in many Linux distributions is vulnerable to a format string attack. The ypbind daemon is used to request information from a Network Information Service (NIS) server. By sending a specially-crafted request to ypbind, a remote attacker can overwrite memory on the stack and execute arbitrary code to gain root access to the system.
Consequences:
Gain Access
Remedy:
For SuSE Linux 7.0:
Upgrade to the latest version of ypbind (3.5-89 or later), as listed in SuSE Security Announcement #042. See References.
For SuSE Linux 6.2 through 6.4:
Upgrade to the latest version of ypbind (3.4-95 or later), as listed in SuSE Security Announcement #042. See References.
For Red Hat Linux 5.x:
Upgrade to the latest version of ypbind (3.3-10 or later), as listed in RHSA-2000:086-05. See References.
For Red Hat Linux 6.x:
Upgrade to the latest version of ypbind (1.7-0.6 or later), as listed in RHSA-2000:086-05. See References.
For Debian GNU/Linux 2.1 (alias slink):
Upgrade to the latest version of nis (3.5.2-1 or later), as listed in Debian Security Advisory 20001014. See References.
For Trustix Secure Linux 1.0x and 1.1:
Upgrade to the latest version of ypbind (3.3-29 or later), as listed in Trustix Security Advisory - ping gnupg ypbind. See References.
For Caldera OpenLinux 2.3 and 2.4:
Install the upgrade packages as listed in Caldera Systems, Inc. Security Advisory CSSA-2000-039.0.
See References.
For other distributions:
Contact your vendor for upgrade or patch information.
References:
- BugTraq Mailing List, Mon Oct 30 2000 - 08:43:28 CST: Trustix Security Advisory - ping gnupg ypbind.
- BugTraq Mailing List, Wed Oct 25 2000 - 03:16:06 CDT: Immunix OS Security Update for ypbind package.
- Caldera International, Inc. Security Advisory CSSA-2000-039.0: security problems in ypbind.
- CIAC Information Bulletin L-009: Red Hat Linux "ypbind" Vulnerability.
- Debian Security Advisory 20001014: nis: local exploit.
- Linux-Mandrake Security Update Advisory MDKSA-2000:064: ypbind and ypserv.
- SuSE Security Announcement SuSE-SA:2000:042: ypbind/ypclient.
- BID-1820: S.u.S.E. ypbind-mt Format String Vulnerability
- BID-1824: Linux ypbind Local Format String Vulnerability
- CVE-2000-1040: Format string vulnerability in logging function of ypbind 3.3, while running in debug mode, leaks file descriptors and allows an attacker to cause a denial of service.
- CVE-2000-1044: Format string vulnerability in ypbind-mt in SuSE SuSE-6.2, and possibly other Linux operating systems, allows an attacker to gain root privileges.
- RHSA-2000-086: ypbind for Red Hat Linux 5.x
Platforms Affected:
- RedHat Linux 6.2
- RedHat Linux
- SUSE SuSE Linux
Reported:
Oct 18, 2000
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