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NSFOCUS Security Advisory(SA2003-03)
Topic: Solaris dtsession Heap Buffer Overflow Vulnerability
Release Date: 2003-03-31
CVE CAN ID: CAN-2003-0092
Sun Solaris 2.5.1 (SPARC/x86) Sun Solaris 2.6 (SPARC/x86) Sun Solaris 7 (SPARC/x86) Sun Solaris 8 (SPARC/x86) Sun Solaris 9 (SPARC/x86)
NSFOCUS Security Team has found a buffer overflow vulnerability in dtsession which is an application in Sun Solaris system. Exploiting the vulnerability local attackers could gain root privilege.
dtsession is a CDE session manager. It provides session management functionality that is compatible to ICCCM 1.1 during the users' session (from login to logout). It launches a window manager and allows to save/restore/lock session, to launch screen saver, and to allocate colors for desktop compatible clients.
By default setuid root bit is set to CDE dtsession which is shipped with Solaris. Because valid length check has not been implemented when handling HOME variable, attackers could cause a heap buffer overflow. By carefully crafting data attackers could run arbitrary code with root privilege.
NSFOCUS suggests to disable suid root bit of dtsession temporarily:
Note: This might prevent a user from being to unlock the screen by the list of keyholders (including root).
2002-12-11 Informed the vendor. 2002-12-13 The vendor confirmed the vulnerability. 2003-03-31 The vendor released a Sun Alert and patches for this issue.
The Sun Alert is available at: http://sunsolve.Sun.COM/pub-cgi/retrieve.pl?doc=fsalert/52388
The patches are:
Solaris 2.6 106027-12 Solaris 2.6_x86 106028-12 Solaris 7 107702-12 Solaris 7_x86 107703-12 Solaris 8 109354-19 Solaris 8_x86 109355-18 Solaris 9 114497-01 Solaris 9_x86 114498-01
The Common Vulnerabilities and Exposures (CVE) project has assigned the name CAN-2003-0092 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems. Candidates may change significantly before they become official CVE entries.
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NSFOCUS Security Team <email@example.com> NSFOCUS INFORMATION TECHNOLOGY CO.,LTD (http://www.nsfocus.com)
PGP Key: http://www.nsfocus.com/homepage/research/pgpkey.asc Key fingerprint = F8F2 F5D1 EF74 E08C 02FE 1B90 D7BF 7877 C6A6 F6DA
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