RHSA-2002_175

Vulnerability from csaf_redhat - Published: 2002-10-04 07:19 - Updated: 2024-11-21 22:27
Summary
Red Hat Security Advisory: : Updated nss_ldap packages fix buffer overflow
Severity
Important
Notes
Topic: Updated nss_ldap packages are now available for Red Hat Linux 6.2, 7, 7.1, 7.2, and 7.3. These updates fix a potential buffer overflow which can occur when nss_ldap is set to configure itself using information stored in DNS, a format string bug in logging functions used in pam_ldap, and to properly handle truncated DNS responses.
Details: nss_ldap is a set of C library extensions that allow X.500 and LDAP directory servers to be used as a primary source of aliases, ethers, groups, hosts, networks, protocols, users, RPCs, services, and shadow passwords (instead of or in addition to using flat files or NIS). When versions of nss_ldap prior to nss_ldap-198 are configured without a value for the "host" setting, nss_ldap will attempt to configure itself by using SRV records stored in DNS. When parsing the results of the DNS query, nss_ldap does not check that the data returned by the server will fit into an internal buffer, leaving it vulnerable to a buffer overflow. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2002-0825 to this issue. When versions of nss_ldap prior to nss_ldap-199 are configured without a value for the "host" setting, nss_ldap will attempt to configure itself by using SRV records stored in DNS. When parsing the results of the DNS query, nss_ldap does not check that the data returned has not been truncated by the resolver libraries to avoid a buffer overflow, and may attempt to parse more data than is actually available, leaving it vulnerable to a read buffer overflow. Versions of pam_ldap prior to version 144 include a format string bug in the logging function. The packages included in this erratum update pam_ldap to version 144, fixing this bug. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2002-0374 to this issue. All users of nss_ldap should update to these errata packages which are not vulnerable to the above issues. The errata packages are based on nss_ldap-189 with the addition of a backported security patch and pam_ldap version 144. Thanks to the nss_ldap and pam_ldap team at padl.com for providing information about these issues.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2002-0374

Format string vulnerability in the logging function for the pam_ldap PAM LDAP module before version 144 allows attackers to execute arbitrary code via format strings in the configuration file name.

Affected products
Product Identifier Version Remediation
Red Hat Linux 6.2
Red Hat / Red Hat Linux
 cpe:/o:redhat:linux:6.2 —
Vendor Fix fix
Red Hat Linux 7.0
Red Hat / Red Hat Linux
 cpe:/o:redhat:linux:7.0 —
Vendor Fix fix
Red Hat Linux 7.1
Red Hat / Red Hat Linux
 cpe:/o:redhat:linux:7.1 —
Vendor Fix fix
Red Hat Linux 7.2
Red Hat / Red Hat Linux
 cpe:/o:redhat:linux:7.2 —
Vendor Fix fix
Red Hat Linux 7.3
Red Hat / Red Hat Linux
 cpe:/o:redhat:linux:7.3 —
Vendor Fix fix
Threats
Impact Important
CVE-2002-0825

Buffer overflow in the DNS SRV code for nss_ldap before nss_ldap-198 allows remote attackers to cause a denial of service and possibly execute arbitrary code.

Affected products
Fixed 5 products, the same list as for CVE-2002-0374
Threats
Impact Important
References
To clipboard 

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        "text": "nss_ldap is a set of C library extensions that allow X.500 and LDAP\ndirectory servers to be used as a primary source of aliases, ethers,\ngroups, hosts, networks, protocols, users, RPCs, services, and shadow\npasswords (instead of or in addition to using flat files or NIS).\n\nWhen versions of nss_ldap prior to nss_ldap-198 are configured without a\nvalue for the \"host\" setting, nss_ldap will attempt to configure itself by\nusing SRV records stored in DNS.  When parsing the results of the DNS\nquery, nss_ldap does not check that the data returned by the server will\nfit into an internal buffer, leaving it vulnerable to a buffer overflow.\nThe Common Vulnerabilities and Exposures project (cve.mitre.org) has\nassigned the name CAN-2002-0825 to this issue.\n\nWhen versions of nss_ldap prior to nss_ldap-199 are configured without a\nvalue for the \"host\" setting, nss_ldap will attempt to configure itself by\nusing SRV records stored in DNS.  When parsing the results of the DNS\nquery, nss_ldap does not check that the data returned has not been\ntruncated by the resolver libraries to avoid a buffer overflow, and may\nattempt to parse more data than is actually available, leaving it\nvulnerable to a read buffer overflow.  \n\nVersions of pam_ldap prior to version 144 include a format string bug in\nthe logging function. The packages included in this erratum update pam_ldap\nto version 144, fixing this bug.  The Common Vulnerabilities and Exposures\nproject (cve.mitre.org) has assigned the name CAN-2002-0374 to this issue.\n\nAll users of nss_ldap should update to these errata packages which are not\nvulnerable to the above issues. The errata packages are based on\nnss_ldap-189 with the addition of a backported security patch and pam_ldap\nversion 144.\n\nThanks to the nss_ldap and pam_ldap team at padl.com for providing\ninformation about these issues.",
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}



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