Red Hat Bugzilla – Bug 1329295
CVE-2016-4912 openslp: null pointer dereference in _xrealloc() function
Last modified: 2017-04-07 14:26:25 EDT
A null pointer dereference vulnerability was found in function _xrealloc() in xlsp_xmalloc.c in OpenSLP. A remote attacker could potentially crash the server when large number of packets are sent. Vulnerable code: void * _xrealloc(const char * file, int line, void * ptr, size_t size) { xallocation_t * x; if (!ptr) return _xmalloc(file, line, size); if (!size) { _xfree(file, line, ptr); return 0; } x = _xmalloc_find(ptr); if (x != 0) { void * newptr = ptr; if (x->size != size) { newptr = _xmalloc(file, line, size); //*** return 0 if failed from _xmalloc memcpy(newptr, ptr, x->size); //*** it'll cased a null pointer reference _xfree(file, line, x); } return newptr; } if (G_xmalloc_fh) fprintf(G_xmalloc_fh, "*** xrealloc called on " "non-xmalloc'd memory ***\n"); return 0; }
Acknowledgments: Name: Yuguang Cai (Qihoo 360)
CVE request at: http://seclists.org/oss-sec/2016/q2/361
Created openslp tracking bugs for this issue: Affects: fedora-all [bug 1337402] Affects: epel-5 [bug 1337403]
Note: Upstream has been made aware of this issue via: https://sourceforge.net/p/openslp/bugs/152/
Curious, why was this closed->WONTFIX ?
openslp-2.0.0-9.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.
openslp-2.0.0-6.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
openslp-2.0.0-8.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
Please note that the function in question - _xmalloc (recently changed to slp_xmalloc for libslp namespace reasons) is a DEBUG-only method. That is, it is only implemented in DEBUG builds of OpenSLP. Given this fact, it's unlikely to be a security issue in any deployment.
Sorry - I meant _xrealloc (now slp_xrealloc).
I've fixed the issue in openslp mercurial commit 1781.