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TITLE:
Sun Solaris ld.so Directory Traversal and Buffer Overflow

SECUNIA ADVISORY ID:
SA23317

VERIFY ADVISORY:
http://secunia.com/advisories/23317/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

OPERATING SYSTEM:
Sun Solaris 9
http://secunia.com/product/95/
Sun Solaris 8
http://secunia.com/product/94/
Sun Solaris 10
http://secunia.com/product/4813/

DESCRIPTION:
A vulnerability and a security issue have been reported in Sun
Solaris, which can be exploited by malicious, local users to disclose
sensitive information or potentially gain escalated privileges.

1) ld.so uses the LANG, LC_ALL, and LC_MESSAGES environment variables
to load localised error messages. This can be exploited to leak
information by loading malicious format specifiers via e.g. directory
traversal sequences within the LANG environment variable.

Note: This vulnerability is limited to information disclosure, but in
combination with the second vulnerability described below, this may be
exploited to execute arbitrary code with escalated privileges.

2) A boundary error exists within the "doprf()" function in ld.so and
can be exploited to cause a buffer overflow by passing specially
crafted strings to the function. This can only be exploited by
unprivileged users in combination with another vulnerability, like
the directory-traversal attack mentioned above.

SOLUTION:
Apply patches or interim security reliefs.

-- SPARC Platform --

Solaris 10:
Apply interim security relief IDR124828-01.

Solaris 9:
Apply patch 112963-27 or later.
http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-112963-27-1

Solaris 8:
Apply patch 109147-42 or later.
http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-109147-42-1

-- x86 Platform --

Solaris 10:
Apply interim security relief IDR124829-01.

Solaris 9:
Apply patch 113986-22 or later.
http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-113986-22-1

Solaris 8:
Apply patch 109148-41 or later.
http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-109148-41-1

PROVIDED AND/OR DISCOVERED BY:
1) Discovered by an anonymous person and reported via iDEFENSE.
2) Sean Larsson, iDefense Labs

ORIGINAL ADVISORY:
iDefense Labs:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=449
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=450

Sun Microsystems:
http://sunsolve.sun.com/search/document.do?assetkey=1-26-102724-1

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About:
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