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TITLE:
radvd Privilege Escalation and Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA46200

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/46200/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=46200

RELEASE DATE:
2011-10-16

DISCUSS ADVISORY:
http://secunia.com/advisories/46200/#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/46200/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
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 * Secunia CVSS Score
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https://ca.secunia.com/?page=viewadvisory&vuln_id=46200

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:
Some security issues and vulnerabilities have been reported in radvd,
which can be exploited by malicious, local users to gain escalated
privileges and by malicious people to cause a DoS (Denial of
Service).

1) A signedness error within the "process_ra()" function (process.c)
when parsing the "ND_OPT_DNSSL_INFORMATION" option can be exploited
to cause a stack-based buffer overflow.

2) An input sanitation error within the "set_interface_var()"
function (device-linux.c) can be exploited to e.g. overwrite
arbitrary files via directory traversal and symlink attacks.

3) The daemon does not properly terminate if the privilege separation
failed, which can lead to the daemon running with higher privileges
than intended.

4) Boundary errors within the "process_ra()" function (process.c) can
be exploited to cause out-of-bounds reads and crash the service.

5) An error within the unicast-only mode can be exploited to cause a
delay within the processing by flooding the service with
ND_ROUTER_SOLICIT messages.

Note: Successful exploitation of this vulnerability requires that the
service is running in unicast-only mode.

The security issues and vulnerabilities are reported in version
1.8.1. Prior versions may also be affected.

SOLUTION:
Update to version 1.8.2, which fixes vulnerabilities #1, #3, #4, and
#5. Security issue #2 is fixed in the GIT repository.

Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

PROVIDED AND/OR DISCOVERED BY:
Vasiliy Kulikov

ORIGINAL ADVISORY:
http://www.openwall.com/lists/oss-security/2011/10/06/3
https://github.com/reubenhwk/radvd/blob/fc207cc6a2de572226133276ee30a9a313dca902/CHANGES
https://github.com/reubenhwk/radvd/commit/7a1471b62da88373e8f4209d503307c5d841b81f

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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About:
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private users keeping their systems up to date against the latest
vulnerabilities.

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Please Note:
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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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