Sendmail malformed .forward file could bypass SMRSH security restrictions
| sendmail-forward-bypass-smrsh (10232) |  Medium Risk |
Description:
Sendmail could allow a local attacker to bypass security restrictions, caused by a vulnerability in the Sendmail Consortium?s Restricted Shell (SMRSH). A local attacker with a valid account could insert special characters into the .forward file to bypass security restrictions and execute shell commands on systems that do not typically allow shell access.
Consequences:
Bypass Security
Remedy:
Apply the smrsh-20020924 patch, available from the Sendmail Web site. See References.
For Conectiva Linux:
Upgrade to the latest sendmail package as listed below. Refer to Conectiva Linux Announcement CLSA-2002:532 for more information. See References.
Conectiva Linux 6.0: 8.11.6-1U60_2cl or later
Conectiva Linux 7.0: 8.11.6-1U70_2cl or later
Conectiva Linux 8.0: 8.11.6-1U80_2cl or later
For FreeBSD:
Upgrade to the latest version of FreeBSD (4.7-STABLE or later) or to the RELENG_4_7 dated after 2002-10-08, or RELENG_4_6, RELENG_4_5, RELENG_4_4, or RELENG_4_3 dated after 2002-10-26 security branch, as listed in FreeBSD Security Advisory FreeBSD-SA-02:41.smrsh. See References.
—OR—
Apply the appropriate patch for your system, as listed in FreeBSD Security Advisory FreeBSD-SA-41.smrsh. See References.
For Mandrake Linux:
Upgrade to the latest sendmail package as listed below. Refer to MandrakeSoft Security Advisory MDKSA-2002:083 for more information. See References.
Mandrake Linux 7.0 and 8.0: 8.11.0-4.1mdk or later
Mandrake Linux 8.1: 8.11.6-4.2mdk or later
Mandrake Linux 8.2: 8.12.1-4.1mdk or later
Mandrake Linux 9.0: 8.12.6-3.1mdk or later
For HP-UX 11.00, 11.11, and 11.22:
Apply the appropriate patch for your system, as listed in Hewlett-Packard Company Security Bulletin HPSBUX0212-234. See References.
For other distributions:
Contact your vendor for upgrade or patch information.
References:
- CIAC Information Bulletin N-030: Sendmail Restricted Shell (smrsh) and Check_Relay Vulnerabilities.
- Conectiva Linux Announcement CLSA-2002:532: sendmail.
- FreeBSD Security Advisory FreeBSD-SA-02:41.smrsh: smrsh restrictions can be bypassed [REVISED].
- Full-Disclosure Mailing List, Tue Oct 08 2002 - 00:29:45 CDT: sendmail smrsh bypass vulnerability. (From Full-Disclosure Mailing List archive)
- iDEFENSE Security Advisory 10.01.02 : Sendmail smrsh bypass vulnerabilities .
- Sendmail Web site: Index of /patches.
- SGI Security Advisory 20030101-01-P: Multiple Vulnerabilities in Sendmail.
- BID-5845: Sendmail SMRSH Double Pipe Access Validation Vulnerability
- CVE-2002-1165: Sendmail Consortium's Restricted Shell (SMRSH) in Sendmail 8.12.6, 8.11.6-15, and possibly other versions after 8.11 from 5/19/1998, allows attackers to bypass the intended restrictions of smrsh by inserting additional commands after (1) || sequences or (2) / characters, which are not properly filtered or verified.
- MDKSA-2002:083: Updated sendmail packages fix smrsh insecurities
- RHSA-2002-259: sendmail security update
- RHSA-2003-073: Updated sendmail packages fix critical security issues
- RHSA-2003-227: Updated sendmail packages fix vulnerabilities
- SA7826: IRIX updates to sendmail
Platforms Affected:
- Conectiva Linux 6.0
- Conectiva Linux 7.0
- Conectiva Linux 8.0
- FreeBSD FreeBSD 4.0
- FreeBSD FreeBSD 4.1
- FreeBSD FreeBSD 4.1.1
- FreeBSD FreeBSD 4.2
- FreeBSD FreeBSD 4.3
- FreeBSD FreeBSD 4.4
- FreeBSD FreeBSD 4.5
- FreeBSD FreeBSD 4.6
- FreeBSD FreeBSD 4.6.1
- FreeBSD FreeBSD 4.6.2
- HP HP-UX 11.00
- HP HP-UX 11.11
- HP HP-UX 11.22
- MandrakeSoft Mandrake Linux 7.2
- MandrakeSoft Mandrake Linux 8.0 PPC
- MandrakeSoft Mandrake Linux 8.0
- MandrakeSoft Mandrake Linux 8.1
- MandrakeSoft Mandrake Linux 8.1 IA64
- MandrakeSoft Mandrake Linux 8.2
- MandrakeSoft Mandrake Linux 8.2 PPC
- MandrakeSoft Mandrake Linux 9.0
- NetBSD NetBSD 1.5
- NetBSD NetBSD 1.5.1
- NetBSD NetBSD 1.5.2
- NetBSD NetBSD 1.5.3
- NetBSD NetBSD 1.6
- NetBSD NetBSD CURRENT
- RedHat Enterprise Linux 2.1 AS
- RedHat Linux 6.2
- RedHat Linux 7
- RedHat Linux 7.1
- RedHat Linux 7.1 for iSeries
- RedHat Linux 7.1 for pSeries
- RedHat Linux 7.2
- RedHat Linux 7.3
- RedHat Linux 8.0
- RedHat Linux Advanced Workstation 2.1 Itanium
- Sendmail Sendmail 8.11
- Sendmail Sendmail 8.11.6-15
- Sendmail Sendmail 8.12.0
- Sendmail Sendmail 8.12.1
- Sendmail Sendmail 8.12.2
- Sendmail Sendmail 8.12.3
- Sendmail Sendmail 8.12.4
- Sendmail Sendmail 8.12.5
- Sendmail Sendmail 8.12.6
- Sendmail Sendmail 8.8.8
- Sendmail Sendmail 8.9.3
Reported:
Oct 01, 2002
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