Bug 1649200

Summary: There is an illegal address access at fromsixel.c:586 (function:sixel_decode_raw_impl) in libsixel latest version that will cause serious impact.
Product: [Other] Security Response Reporter: shuitao gan <ganshuitao>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: urgent Docs Contact:
Priority: unspecified    
Version: unspecified   
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Hardware: All   
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Last Closed: 2018-11-13 14:44:50 UTC Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Flags
./img2sixel POC3 none

Description shuitao gan 2018-11-13 06:16:28 UTC 
Created attachment 1505141 [details]
./img2sixel   POC3

version: libsixel latest version(v1.8.2)


Summary: 

There is an illegal address access at fromsixel.c:586 (function:sixel_decode_raw_impl) in libsixel latest version that will 
cause serious impact.


Description:

The asan debug is as follows:

$./img2sixel   POC3
=================================================================
=================================================================
==626==ERROR: AddressSanitizer: SEGV on unknown address 0x610fe38ed6c0 (pc 0x7f0377c8e2f7 bp 0x000000000003 sp 0x7fffa39b5cd0 
T0)
    #0 0x7f0377c8e2f6 in sixel_decode_raw_impl /home/company/real_sanitize/libsixel-master/src/fromsixel.c:586
    #1 0x7f0377c8e8b1 in sixel_decode_raw /home/company/real_sanitize/libsixel-master/src/fromsixel.c:881
    #2 0x7f0377cc042c in load_sixel /home/company/real_sanitize/libsixel-master/src/loader.c:613
    #3 0x7f0377cc042c in load_with_builtin /home/company/real_sanitize/libsixel-master/src/loader.c:782
    #4 0x7f0377cc43d9 in sixel_helper_load_image_file /home/company/real_sanitize/libsixel-master/src/loader.c:1352
    #5 0x7f0377ccf283 in sixel_encoder_encode /home/company/real_sanitize/libsixel-master/src/encoder.c:1737
    #6 0x4017f8 in main /home/company/real_sanitize/libsixel-master/converters/img2sixel.c:457
    #7 0x7f0377688a3f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x20a3f)
    #8 0x401918 in _start (/home/company/real_sanitize/poc_check/libsixel/img2sixel+0x401918)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /home/company/real_sanitize/libsixel-master/src/fromsixel.c:586 sixel_decode_raw_impl
==626==ABORTING
Comment 1 Andrej Nemec 2018-11-13 14:44:50 UTC 
Hello,

Red Hat does not ship libsixel in any of our supported products. Please, report these issues upstream at:

https://github.com/saitoha/libsixel/issues

Thanks!