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TITLE:
Exim "open_log()" Privilege Escalation Security Issue

SECUNIA ADVISORY ID:
SA43101

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/43101/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=43101

RELEASE DATE:
2011-01-31

DISCUSS ADVISORY:
http://secunia.com/advisories/43101/#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/43101/

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=43101

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:
A security issue has been reported in Exim, which can be exploited by
malicious, local users to perform certain actions with escalated
privileges.

The security issue is caused due the "open_log()" function in log.c
incorrectly checking the return values of e.g. the "setuid()" and
"setgid()" functions, which can be exploited to append data to
arbitrary files via symlink attacks.

SOLUTION:
Update to version 4.74.

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

ORIGINAL ADVISORY:
http://lists.exim.org/lurker/message/20110126.034702.4d69c278.en.html
ftp://ftp.exim.org/pub/exim/ChangeLogs/ChangeLog-4.74

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/

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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.

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