---------------------------------------------------------------------- Secunia CSI integrated with Microsoft WSUS and Microsoft SCCM for 3rd party Patch Management Free webinars http://secunia.com/vulnerability_scanning/corporate/webinars/ ---------------------------------------------------------------------- TITLE: exim Hardlink Handling and MBX Locking Two Weaknesses SECUNIA ADVISORY ID: SA40019 VERIFY ADVISORY: Secunia.com http://secunia.com/advisories/40019/ Customer Area (Credentials Required) https://ca.secunia.com/?page=viewadvisory&vuln_id=40019 RELEASE DATE: 2010-05-31 DISCUSS ADVISORY: http://secunia.com/advisories/40019/#comments AVAILABLE ON SITE AND IN CUSTOMER AREA: * Last Update * Popularity * Comments * Criticality Level * Impact * Where * Solution Status * Operating System / Software * CVE Reference(s) http://secunia.com/advisories/40019/ ONLY AVAILABLE IN CUSTOMER AREA: * Authentication Level * Report Reliability * Secunia PoC * Secunia Analysis * Systems Affected * Approve Distribution * Remediation Status * Secunia CVSS Score * CVSS https://ca.secunia.com/?page=viewadvisory&vuln_id=40019 ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI: * AUTOMATED SCANNING http://secunia.com/vulnerability_scanning/personal/ http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/ DESCRIPTION: Dan Rosenberg has reported two weaknesses in exim, which can be exploited by malicious, local users to perform certain actions with escalated privileges. 1) An error when handling hardlinks within the mail directory during the mail delivery process can be exploited to e.g. append information to arbitrary files of another user. Successful exploitation requires that the mail directory is world-writable with the sticky bit set. 2) A race condition related to the MBX locking can be exploited to e.g. change the permissions of another user's file via symlink attacks. Successful exploitation requires that MBX locking is used. SOLUTION: Fixed in the CVS repository and exim 4.72RC2. Further details available in Customer Area: http://secunia.com/products/corporate/EVM/ PROVIDED AND/OR DISCOVERED BY: Dan Rosenberg ORIGINAL ADVISORY: http://lists.exim.org/lurker/message/20100524.175925.9a69f755.en.html http://vcs.exim.org/viewvc/exim/exim-doc/doc-txt/ChangeLog?view=markup&pathrev=exim-4_72_RC2 1) http://bugs.exim.org/show_bug.cgi?id=988 2) http://bugs.exim.org/show_bug.cgi?id=989 OTHER REFERENCES: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/ DEEP LINKS: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/ EXTENDED DESCRIPTION: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/ EXTENDED SOLUTION: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/ EXPLOIT: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/ ---------------------------------------------------------------------- About: This Advisory was delivered by Secunia as a free service to help private users keeping their systems up to date against the latest vulnerabilities. Subscribe: http://secunia.com/advisories/secunia_security_advisories/ Definitions: (Criticality, Where etc.) http://secunia.com/advisories/about_secunia_advisories/ Please Note: Secunia recommends that you verify all advisories you receive by clicking the link. Secunia NEVER sends attached files with advisories. Secunia does not advise people to install third party patches, only use those supplied by the vendor. ---------------------------------------------------------------------- Unsubscribe: Secunia Security Advisories http://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org ----------------------------------------------------------------------