CVE-2013-0340
Publication date 21 January 2014
Last updated 24 July 2024
Ubuntu priority
expat 2.1.0 and earlier does not properly handle entities expansion unless an application developer uses the XML_SetEntityDeclHandler function, which allows remote attackers to cause a denial of service (resource consumption), send HTTP requests to intranet servers, or read arbitrary files via a crafted XML document, aka an XML External Entity (XXE) issue. NOTE: it could be argued that because expat already provides the ability to disable external entity expansion, the responsibility for resolving this issue lies with application developers; according to this argument, this entry should be REJECTed, and each affected application would need its own CVE.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| apache2 | ||
| apr-util | ||
| audacity | ||
| ayttm | ||
| cableswig | ||
| cadaver | ||
| celementtree | ||
| cmake | ||
| coin3 | ||
| expat | ||
| gdcm | ||
| ghostscript | ||
| grmonitor | ||
| insighttoolkit | ||
| kompozer | ||
| libparagui1.1 | ||
| matanza | ||
| paraview | ||
| poco | ||
| python-xml | ||
| python2.4 | ||
| python2.5 | ||
| python2.6 | ||
| simgear | ||
| sitecopy | ||
| smart | ||
| swish-e | ||
| tdom | ||
| texlive-bin | ||
| tla | ||
| vnc4 | ||
| vtk | ||
| w3c-libwww | ||
| wbxml2 | ||
| wxwidgets2.6 | ||
| wxwidgets2.8 | ||
| wxwindows2.4 | ||
| xmlrpc-c | ||
| xotcl | ||
| xulrunner | ||
Notes
jdstrand
PoC in oss-sec no upstream commits as of 2013-03-21. Contacted upstream on their (possibly moderated) expat-bugs mailing list since their bug tracker was down still no commits or upstream comments as of 2013-04-23
mdeslaur
Expat does not read or parse external entities directly, it is up to applications to do so. http://seclists.org/oss-sec/2013/q2/78 marking as ignored, application-specific CVEs should be assigned to individual applications.
seth-arnold
upstream libexpat has introduced heuristics in 2.4.0 to limit the damage due to various entity expansion issues. These fixes won't be backported to previous releases due to the risk of regression due to the size, complexity, and new APIs.