#VU31844 Out-of-bounds read in expat - CVE-2009-3560
Vulnerability identifier: #VU31844
Vulnerability risk: Medium
CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID:
CWE-ID:
CWE-125
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
expat
Universal components / Libraries /
Libraries used by multiple products
Vendor: libexpat.org
Description
The vulnerability allows a remote attacker to perform denial of service (DoS) attack.
The vulnerability exists due to a boundary condition when processing an XML document with malformed UTF-8 sequences that trigger a buffer over-read, related to the doProlog function in lib/xmlparse.c, a different vulnerability than CVE-2009-2625 and CVE-2009-3720 within the The big2_toUtf8 function in lib/xmltok.c in libexpat in Expat 2.0.1, as used. A remote attacker can create a specially crafted file, pass it to the application, trigger out-of-bounds read error and crash the affected application.
Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.
Vulnerable software versions
expat: 11.0.5
External links
https://expat.cvs.sourceforge.net/viewvc/expat/expat/lib/xmlparse.c?r1=1.164&r2=1.165
https://expat.cvs.sourceforge.net/viewvc/expat/expat/lib/xmlparse.c?view=log#rev1.165
https://lists.opensuse.org/opensuse-security-announce/2010-01/msg00007.html
https://lists.opensuse.org/opensuse-security-announce/2010-05/msg00001.html
https://lists.opensuse.org/opensuse-security-announce/2010-05/msg00002.html
https://lists.opensuse.org/opensuse-security-announce/2010-06/msg00001.html
https://lists.opensuse.org/opensuse-security-announce/2010-08/msg00001.html
https://lists.vmware.com/pipermail/security-announce/2010/000082.html
https://mail.python.org/pipermail/expat-bugs/2009-November/002846.html
https://marc.info/?l=bugtraq&m=130168502603566&w=2
https://secunia.com/advisories/37537
https://secunia.com/advisories/38231
https://secunia.com/advisories/38794
https://secunia.com/advisories/38832
https://secunia.com/advisories/38834
https://secunia.com/advisories/39478
https://secunia.com/advisories/41701
https://secunia.com/advisories/43300
https://slackware.com/security/viewer.php?l=slackware-security&y=2011&m=slackware-security.486026
https://sunsolve.sun.com/search/document.do?assetkey=1-66-273630-1
https://www.debian.org/security/2009/dsa-1953
https://www.mandriva.com/security/advisories?name=MDVSA-2009:316
https://www.redhat.com/support/errata/RHSA-2011-0896.html
https://www.securityfocus.com/bid/37203
https://www.securitytracker.com/id?1023278
https://www.ubuntu.com/usn/USN-890-1
https://www.ubuntu.com/usn/USN-890-6
https://www.vupen.com/english/advisories/2010/0528
https://www.vupen.com/english/advisories/2010/0896
https://www.vupen.com/english/advisories/2010/1107
https://www.vupen.com/english/advisories/2011/0359
https://bugzilla.redhat.com/show_bug.cgi?id=533174
https://lists.apache.org/thread.html/54a42d4b01968df1117cea77fc53d6beb931c0e05936ad02af93e9ac@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/5df9bfb86a3b054bb985a45ff9250b0332c9ecc181eec232489e7f79@%3Ccvs.httpd.apache.org%3E
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10613
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12942
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6883
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00370.html
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00394.html
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00413.html
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
