MIT Kerberos Telnet Client Buffer Overflow Vulnerabilities - Secunia Advisories - Vulnerability Intelligence

MIT Kerberos Telnet Client Buffer Overflow Vulnerabilities
Secunia Advisory:	SA14745	Advisory Toolbox: Issue ticket Save in to-do list Mark as handled Exploit information Download as PDF Review actions Add comment
Release Date:	2005-03-29
Last Update:	2005-04-04
Popularity:	17,903 views

Critical:	Moderately critical
Impact:	System access
Where:	From remote
Solution Status:	Vendor Patch

Software:	Kerberos 5.x

Subscribe:	Instant alerts on relevant vulnerabilities

CVE reference:	CVE-2005-0468 CVE-2005-0469

Description: Gaël Delalleau has reported two vulnerabilities in Kerberos V5, which can be exploited by malicious people to compromise a vulnerable system. 1) A boundary error in the "slc_add_reply()" function in the included telnet client when handling LINEMODE suboptions can be exploited to cause buffer overflow via a specially crafted reply containing a large number of SLC (Set Local Character) commands. 2) A boundary error in the "env_opt_add()" function in the included telnet client when handling NEW-ENVIRON suboptions can be exploited to cause a heap-based buffer overflow via a specially crafted reply containing a large number of characters that need escaping. Successful exploitation allows execution of arbitrary code, but requires that a user connects to a malicious server with the vulnerable telnet client. The vulnerabilities affect versions up to and including release krb5-1.4. Solution: Apply patch: http://web.mit.edu/kerberos/advisories/2005-001-patch_1.4.txt http://web.mit.edu/kerberos/advisories/2005-001-patch_1.4.txt.asc Provided and/or discovered by: Gaël Delalleau Changelog: 2005-03-30: Added link to US-CERT vulnerability note. 2005-04-04: Added link to US-CERT vulnerability note. Original Advisory: MIT: http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2005-001-telnet.txt iDEFENSE: http://www.idefense.com/application/poi/display?id=220&type=vulnerabilities http://www.idefense.com/application/poi/display?id=221&type=vulnerabilities Other References: US-CERT VU#291924: http://www.kb.cert.org/vuls/id/291924 US-CERT VU#341908: http://www.kb.cert.org/vuls/id/341908

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