There is an invalid free in the MagickFree function in magick/memory.c in GraphicsMagick 1.3.26 that will lead to a remote denial of service attack.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
| Link | Tags |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1484196 | issue tracking |
| http://openwall.com/lists/oss-security/2017/08/29/4 | mailing list |
| http://www.securityfocus.com/bid/100518 | third party advisory vdb entry |
| http://hg.graphicsmagick.org/hg/GraphicsMagick/rev/3db9449e3d6a/ | patch vendor advisory |
| https://www.debian.org/security/2018/dsa-4321 | third party advisory vendor advisory |
| https://bugs.debian.org/878511 | third party advisory issue tracking |
| https://lists.debian.org/debian-lts-announce/2018/08/msg00002.html | third party advisory mailing list |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PF62B5PJA2JDUOCKJGUQO3SPL74BEYSV/ | vendor advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WHIKB4TP6KBJWT2UIPWL5MWMG5QXKGEJ/ | vendor advisory |
| https://usn.ubuntu.com/4222-1/ | vendor advisory |