|发布时间 :2004-09-28 00:00:00|
|修订时间 :2016-10-17 22:47:10|
[原文]Double free vulnerability in the krb5_rd_cred function for MIT Kerberos 5 (krb5) 1.3.1 and earlier may allow local users to execute arbitrary code.
[CNNVD]MIT Kerberos 5多个Double-Free漏洞 (CNNVD-200409-063)
用于MIT Kerberos 5 (krb5) 1.3.1及其早期版本的krb5_rd_cred函数存在Double-free漏洞。本地用户可以利用该漏洞执行任意代码。
- CVSS (基础分值)
- CWE (弱点类目)
- CPE (受影响的平台与产品)
- OVAL (用于检测的技术细节)
|oval:org.mitre.oval:def:3322||Kerberos 5 Double-free Vulnerability in krb5_rd_cred Function|
|oval:org.mitre.oval:def:10267||Double free vulnerability in the krb5_rd_cred function for MIT Kerberos 5 (krb5) 1.3.1 and earlier may allow local users to execute arbitrar...|
|MIT Kerberos 5多个Double-Free漏洞|
|2004-09-28 00:00:00||2005-10-20 00:00:00|
|用于MIT Kerberos 5 (krb5) 1.3.1及其早期版本的krb5_rd_cred函数存在Double-free漏洞。本地用户可以利用该漏洞执行任意代码。|
The vendor has released an advisory (MITKRB5-SA-2004-002) along with patches to resolve these issues. Please see the referenced advisory for further information.
Debian GNU/Linux has released an advisory (DSA 543-1) along with fixes to address these and other issues. Please see the referenced advisory for further information.
RedHat Linux has released advisory RHSA-2004:350-12 along with fixes to address these and other issues in RedHat Enterprise Linux operating systems. Please see the referenced advisory for further information.
RedHat Linux has released advisories (FEDORA-2004-276, and FEDORA-2004-277) to address these and other issues for RedHat Fedora Core 1 and 2 respectively. Please see the referenced advisories for further information.
Cisco has released an advisory (cisco-sa-20040831-krb5) to address these and other issues for Cisco VPN 3000 series products. Please see the referenced advisory for further information on obtaining fixes.
Mandrake has released an advisory (MDKSA-2004:088) and fixes to address these issues. Please see the referenced advisory for further information on obtaining fixes.
Trustix has released an advisory (TSL-2004-0045) to address various issues in kerberos5. Please see the referenced advisory for more information.
Gentoo advisory available. Users are advised to upgrade by performing the following steps:
emerge -pv ">=app-crypt/mit-krb5-1.3.4"
Conectiva has made advisory CLSA-2004:860 along with fixes available resolving these and other issues. Please see the referenced advisory for more information.
Avaya has released advisory ASA-2004-039 dealing with these issues. Please see the referenced web advisory for more information.
OpenPKG has released advisory OpenPKG-SA-2004.039 to address these, and other issues. Please see the referenced advisory for further information.
Turbolinux has released advisory TLSA-2004-22 to address these, and other issues. Please see the referenced advisory for further information.
Sun has released Security Alert ID 57631 along with fixes for these issues. Please see the web reference for more information. On 24 Sept 2004, Sun withdrew patch 112908-15. On 28 Sept 2004, the patch has become available again with an updated Security Alert.
IBM has released an advisory (2004-09-30-ASN.1) to address these issues in AIX. Please see the referenced advisory for more information about obtaining fixes.
IBM has released information about some of these issues affecting IBM Tivoli Access Manager for e-business version 5.1. Please see the IBM 'MIT Kerberos 5 Vulnerabilities' reference in Web references for more information about obtaining fixes.
Apple has released an advisory (APPLE-SA-2004-12-02) dealing with this and other issues. Please see the referenced advisory for more information.
Fedora Legacy has released security advisory FLSA:154276 addressing this issue for RedHat Linux 7.3 and 9, and for Fedora Core 1. Please see the referenced advisory for details on obtaining and applying the appropriate updates.
Sun SEAM 1.0.2
MIT Kerberos 5 1.2.4
- 漏洞信息 (F34229)
MIT krb5 Security Advisory 2004-002 - The MIT Kerberos 5 implementation's Key Distribution Center (KDC) program contains a double-free vulnerability that potentially allows a remote attacker to execute arbitrary code. Compromise of a KDC host compromises the security of the entire authentication realm served by the KDC. Additionally, double-free vulnerabilities exist in MIT Kerberos 5 library code, making client programs and application servers vulnerable.
-----BEGIN PGP SIGNED MESSAGE----- MIT krb5 Security Advisory 2004-002 Original release: 2004-08-31 Topic: double-free vulnerabilities in KDC and libraries Severity: CRITICAL SUMMARY ======= The MIT Kerberos 5 implementation's Key Distribution Center (KDC) program contains a double-free vulnerability that potentially allows a remote attacker to execute arbitrary code. Compromise of a KDC host compromises the security of the entire authentication realm served by the KDC. Additionally, double-free vulnerabilities exist in MIT Kerberos 5 library code, making client programs and application servers vulnerable. Exploitation of double-free bugs is believed to be difficult. No exploits are known to exist for these vulnerabilities. IMPACT ====== * A unauthenticated remote attacker can potentially execute arbitrary code on a KDC host, compromising an entire Kerberos realm. [CAN-2004-0642] * A remote attacker can potentially execute arbitrary code on a host running krb524d, possibly compromising an entire Kerberos realm if the host is a KDC host. [CAN-2004-0772] * An authenticated attacker can also potentially execute arbitrary code on hosts running vulnerable services. [CAN-2004-0643] * An attacker impersonating a legitimate KDC or application server can potentially execute arbitrary code on a client host while the client is authenticating. [CAN-2004-0642] AFFECTED SOFTWARE ================= * KDC software from all releases of MIT Kerberos 5 up to and including krb5-1.3.4. [CAN-2004-0642] * The krb524d program from krb5-1.2.8 and later. The krb524d present in earlier releases is vulnerable if it has been patched to disable krb4 cross-realm functionality. [CAN-2004-0772] * Applications calling the krb5_rd_cred() function in releases prior to krb5-1.3.2. Such applications in the MIT krb5 releases include the remote login daemons (krshd, klogind, and telnetd) and the FTP daemon. The krb5_rd_cred() function decrypts and decodes forwarded Kerberos credentials. Third-party applications calling this function directly or indirectly (by means of the GSSAPI or other libraries) are vulnerable. [CAN-2004-0643] * Client code from all releases of MIT Kerberos 5 up to and including krb5-1.3.4. Third-party applications directly or indirectly calling client library functions may also be vulnerable. [CAN-2004-0642] FIXES ===== * The upcoming krb5-1.3.5 release will contain fixes for these problems. * Apply the appropriate patch or patches referenced below, and rebuild the software. - If you are running krb5-1.3 through krb5-1.3.4, apply 2004-002-patch_1.3.4.txt. - If you are running krb5-1.3 through krb5-1.3.1, apply 2004-002-patch_1.3.1.txt. - If you are running krb5-1.2.8, apply 2004-002-patch_1.2.8.txt. - Things become more complicated if you are running krb5-1.2 through krb5-1.2.7. The correct set of patches to apply will depend on whether you have applied the patches to disable krb4 cross-realm functionality [MITKRB5-SA-2003-004]. + If you are running krb5-1.2.6 through krb5-1.2.7, and have applied the patches to disable krb4 cross-realm functionality, apply 2004-002-patch_1.2.8.txt. + If you are running krb5-1.2 through krb5-1.2.5, and have applied the patches to disable krb4 cross-realm functionality, apply 2004-002-patch_1.2.7.txt, followed by 2004-002-k524d_patch_1.2.5.txt. + If you are running krb5-1.2 through krb5-1.2.7, and have not applied the patches to disable krb4 cross-realm functionality, apply 2004-002-patch_1.2.7.txt. Summary chart of patches to apply for releases krb5-1.2 through krb5-1.2.7: | patched for 2003-004 | not patched for 2003-004 -----------+--------------------------------+-------------------------- krb5-1.2.7 | | -----------+ 2004-002-patch_1.2.8.txt | krb5-1.2.6 | | -----------+--------------------------------+ 2004-002-patch_1.2.7.txt krb5-1.2.5 | 2004-002-patch_1.2.7.txt | through | and | krb5-1.2 | 2004-002-k524d_patch_1.2.5.txt | Patches available: * Patch for krb5-1.3.4 (2004-002-patch_1.3.4.txt) * Patch for krb5-1.3.1 (2004-002-patch_1.3.1.txt) * Patch for krb5-1.2.8 (2004-002-patch_1.2.8.txt) * Patch for krb5-1.2.7 (2004-002-patch_1.2.7.txt) * Patch for krb524d in krb5-1.2.5 which has been previously patched to disable krb4 cross-realm (2004-002-k524d_patch_1.2.5.txt) Note: Each patch are generated against the specific release noted above. The patches may apply with some offset against other compatible releases listed above. 2004-002-patch_1.3.4.txt ======================== http://web.mit.edu/kerberos/advisories/2004-002-patch_1.3.4.txt The associated detached PGP signature is at: http://web.mit.edu/kerberos/advisories/2004-002-patch_1.3.4.txt.asc 2004-002-patch_1.3.1.txt ======================== http://web.mit.edu/kerberos/advisories/2004-002-patch_1.3.1.txt The associated detached PGP signature is at: http://web.mit.edu/kerberos/advisories/2004-002-patch_1.3.1.txt.asc 2004-002-patch_1.2.8.txt ======================== http://web.mit.edu/kerberos/advisories/2004-002-patch_1.2.8.txt The associated detached PGP signature is at: http://web.mit.edu/kerberos/advisories/2004-002-patch_128.txt.asc 2004-002-patch_1.2.7.txt ======================== http://web.mit.edu/kerberos/advisories/2004-002-patch_1.2.7.txt The associated detached PGP signature is at: http://web.mit.edu/kerberos/advisories/2004-002-patch_1.2.7.txt.asc 2004-002-k524d_patch_1.2.5.txt ============================== http://web.mit.edu/kerberos/advisories/2004-002-k524d_patch_1.2.5.txt The associated detached PGP signature is at: http://web.mit.edu/kerberos/advisories/2004-002-k524d_patch_1.2.5.txt.asc REFERENCES ========== This announcement and related security advisories may be found on the MIT Kerberos security advisory page at: http://web.mit.edu/kerberos/advisories/index.html The main MIT Kerberos web page is at: http://web.mit.edu/kerberos/index.html CERT VU#795632 http://www.kb.cert.org/vuls/id/795632 CVE CAN-2004-0642 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0642 KDC and client libraries double-free on error conditions in MIT Kerberos 5 releases krb5-1.3.4 and earlier, allowing unauthenticated remote attackers to execute arbitrary code CERT VU#866472 http://www.kb.cert.org/vuls/id/866472 CVE CAN-2004-0643 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0643 krb5_rd_cred() double-frees on error conditions in MIT Kerberos 5 releases krb5-1.3.1 and earlier, allowing authenticated attackers to execute arbitrary code VU#350792 http://www.kb.cert.org/vuls/id/350792 CVE CAN-2004-0772 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0772 krb524d in krb5-1.2.8 and later double-frees on error conditions, allowing remote attackers to execute arbitrary code. Earlier releases patched for the krb4 protocol vulnerability [MITKRB5-SA-2003-004] are also vulnerable. ACKNOWLEDGMENTS =============== Thanks to Will Fiveash and Nico Williams at Sun for finding some of these vulnerabilities and for providing initial patches. Thanks to Marc Horowitz for discovering the krb524d vulnerability. Thanks to Nalin Dahyabhai for providing a corrected patch for krb524d in releases krb5-1.2 through krb5-1.2.5 in cases where krb524d has been patched to disable krb4 cross-realm functionality. Thanks to Joseph Galbraith and John Hawkinson, who both independently discovered the double-free in krb5_rd_cred() which was corrected in release krb5-1.3.2. DETAILS ======= In the MIT krb5 library, in all releases up to and including krb5-1.3.4, ASN.1 decoder functions and their callers do not use a consistent set of memory management conventions. The callers expect the decoders to allocate memory. The callers typically have error-handling code which frees memory allocated by the ASN.1 decoders if pointers to the allocated memory are non-null. Upon encountering error conditions, the ASN.1 decoders themselves free memory which they have allocated, but do not null the corresponding pointers. When some library functions receive errors from the ASN.1 decoders, they attempt to pass the non-null pointer (which points to freed memory) to free(), causing a double-free. In all releases of MIT krb5 up to and including krb5-1.3.4, cleanup code in the KDC frees memory returned by ASN.1 decoders. This cleanup code only frees memory pointed to by non-null pointers, but if an ASN.1 decoder returns an error, the cleanup code will free memory previously freed by the decoder. Implementations of krb5_rd_cred() prior to the krb5-1.3.2 release contained code to explicitly free the buffer returned by the ASN.1 decoder function decode_krb5_enc_cred_part() when the decoder returns an error. This is another double-free, since the decoder would itself free the buffer on error. Since decode_krb5_enc_cred_part() does not get called unless the decryption of the encrypted part of the KRB-CRED is successful, the attacker needs to have authenticated. This code was corrected in the krb5-1.3.2 release. The patch (introduced in krb5-1.2.8 and present in all subsequent releases) for disabling krb4 cross-realm authentication in krb524d introduced a double-free vulnerability. If handle_classic_v4() denies the conversion of a cross-realm ticket, v5tkt->enc_part2 gets freed but not nulled, so do_connection() double-frees many things when it subsequently calls krb5_free_ticket(). REVISION HISTORY ================ 2004-08-31 original release Copyright (C) 2004 Massachusetts Institute of Technology -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (SunOS) iQCVAwUBQTTAUabDgE/zdoE9AQHSFwP/S0bIduge4dDmZiTlDEUa5L1CjESpAq3O 905Ru47xTmKqKpCC6cpIxpFqeXZAZkc8HzIp4kaZUNJ3+cik2Mg+YSdP5mM9ys67 geZZoF6pufgh9Ym4gMK6YJjYxsJgSrEbcpgrYv710GEy1SqsE2o7O0Y5WSYv3Df+ 8Nz22+QoVzw= =dpRb -----END PGP SIGNATURE-----
|MIT Kerberos 5 krb524d krb5_rd_cred() Arbitrary Code Execution|
|Remote / Network Access||Input Manipulation|
|Loss of Integrity|
|Keberos contains a flaw that may allow a malicious user to execute arbitrary commaands. The issue is triggered when krb5_rd_cread() tries to free allready freed buffers that were returned by decode_krb5_enc_cred_part() when error occurs. It is possible that the flaw may allow compromise entire Kerberos realm if victim is running KDC resulting in a loss of integrity.|
|Upgrade to version 5-1.3.2 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.|
|Unknown or Incomplete|