Package: gif2png Version: 2.5.8-1+b2 Severity: normal Dear Maintainer,
Running 'gif2png -r' with the attached file raises a NULL pointer dereference, which may allow a denial-of-service attack of a malicious attacker. I expected the program to terminate without segfault, but the program crashes as follow. ---------------------------- (gdb) r -r poc Starting program: /usr/bin/gif2png -r poc gif2png: bad version number, not '87a' or '89a', trying anyway gif2png: error in reading DataBlock gif2png: EOF / read error on image data Program received signal SIGSEGV, Segmentation fault. strlen () at ../sysdeps/x86_64/strlen.S:106 106 ../sysdeps/x86_64/strlen.S: No such file or directory. (gdb) x/i $rip => 0x7ffff7887646 <strlen+38>: movdqu (%rax),%xmm4 (gdb) i r rax rax 0x0 0 ----------------------------- The bug was found with a fuzzer developed by 'SoftSec' group at KAIST. -- System Information: Debian Release: 9.2 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 4.9.0-3-amd64 (SMP w/1 CPU core) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages gif2png depends on: ii libc6 2.24-11+deb9u1 ii libpng16-16 1.6.28-1 Versions of packages gif2png recommends: ii python 2.7.13-2 gif2png suggests no packages. -- no debconf information
poc
Description: Binary data
