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TITLE:
Exim "dkim_exim_verify_finish()" Format String Vulnerability

SECUNIA ADVISORY ID:
SA44467

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/44467/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=44467

RELEASE DATE:
2011-05-06

DISCUSS ADVISORY:
http://secunia.com/advisories/44467/#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/44467/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
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https://ca.secunia.com/?page=viewadvisory&vuln_id=44467

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 vulnerability has been discovered in Exim, which potentially can be
exploited by malicious people to compromise a vulnerable system.

The vulnerability is caused due to a format string error within the
"dkim_exim_verify_finish()" function in src/dkim.c when handling DKIM
signatures containing format string specifiers, which can be exploited
to e.g. cause a crash or memory corruption by sending emails with a
specially crafted "DKIM-Signature:" header.

The vulnerability is confirmed in version 4.75. Other versions may
also be affected.

SOLUTION:
Fixed in version 4.76 RC1.

PROVIDED AND/OR DISCOVERED BY:
John Levine

ORIGINAL ADVISORY:
http://bugs.exim.org/show_bug.cgi?id=1106
https://lists.exim.org/lurker/message/20110506.112357.e99a8db1.en.html
https://lists.exim.org/lurker/thread/20110505.110843.508a1c46.en.html

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.

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