Bug 1471782
| Summary: | There is an illegal address access in eval.cpp of libsass | ||||||
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| Product: | [Fedora] Fedora | Reporter: | owl337 <v.owl337> | ||||
| Component: | sassc | Assignee: | Aurelien Bompard <aurelien> | ||||
| Status: | CLOSED UPSTREAM | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||
| Severity: | urgent | Docs Contact: | |||||
| Priority: | unspecified | ||||||
| Version: | 27 | CC: | aurelien, mcatanza | ||||
| Target Milestone: | --- | Keywords: | Security | ||||
| Target Release: | --- | ||||||
| Hardware: | x86_64 | ||||||
| OS: | Linux | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2020-11-02 15:08:35 UTC | Type: | Bug | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
| Bug Depends On: | |||||||
| Bug Blocks: | 1474937 | ||||||
| Attachments: |
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Reported upstream as https://github.com/sass/libsass/issues/2446 This bug appears to have been reported against 'rawhide' during the Fedora 27 development cycle. Changing version to '27'. This message is a reminder that Fedora 27 is nearing its end of life. On 2018-Nov-30 Fedora will stop maintaining and issuing updates for Fedora 27. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as EOL if it remains open with a Fedora 'version' of '27'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version. Thank you for reporting this issue and we are sorry that we were not able to fix it before Fedora 27 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora, you are encouraged change the 'version' to a later Fedora version prior this bug is closed as described in the policy above. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete. |
Created attachment 1299841 [details] Triggered by "./sassc POC" Description of problem: There is an illegal address access in eval.cpp of libsass Version-Release number of selected component (if applicable): <= latest version How reproducible: ./sassc $POC Steps to Reproduce: The debugging information is as follows: $ ./sassc POC Program received signal SIGSEGV, Segmentation fault. Sass::Eval::operator() (this=0x7fffffffde20, m=0x646820) at eval.cpp:526 526 Expression_Ptr ex_val = m->at(key)->perform(this); (gdb) bt #0 Sass::Eval::operator() (this=0x7fffffffde20, m=0x646820) at eval.cpp:526 #1 0x00007ffff79ace11 in Sass::Eval::operator() (this=0x7fffffffde20, l=0x631630) at eval.cpp:491 #2 0x00007ffff79b053f in Sass::Eval::operator() (this=0x7fffffffde20, b_in=<optimized out>) at eval.cpp:721 #3 0x00007ffff79acbc3 in Sass::Eval::operator() (this=0x7fffffffde20, l=0x631080) at eval.cpp:503 #4 0x00007ffff79f2bb4 in Sass::Expand::operator() (this=<optimized out>, a=<optimized out>) at expand.cpp:330 #5 0x00007ffff7a09771 in Sass::Expand::append_block (this=0x7fffffffde10, b=<optimized out>) at expand.cpp:799 #6 0x00007ffff79e9f89 in Sass::Expand::operator() (this=0x7fffffffde10, b=0x630f10) at expand.cpp:81 #7 0x00007ffff7800358 in Sass::Context::compile (this=0x62ff40) at context.cpp:659 #8 0x00007ffff77fd303 in Sass::File_Context::parse (this=0x62ff40) at context.cpp:588 #9 0x00007ffff7b16376 in Sass::sass_parse_block (compiler=0x630480) at sass_context.cpp:227 #10 sass_compiler_parse (compiler=0x630480) at sass_context.cpp:476 #11 0x00007ffff7b15562 in sass_compile_context (c_ctx=0x62fda0, cpp_ctx=0x7ffff7fda050) at sass_context.cpp:364 #12 0x00007ffff7b1592a in sass_compile_file_context (file_ctx=0x62fda0) at sass_context.cpp:463 #13 0x0000000000402796 in compile_file (options=0x62fd20, input_path=<optimized out>, outfile=0x0) at sassc.c:145 #14 0x0000000000403117 in main (argc=<optimized out>, argv=<optimized out>) at sassc.c:335 The asan debug info is as follows: ASAN:SIGSEGV ================================================================= ==31154==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7f1450d3b64d bp 0x7ffdff76db10 sp 0x7ffdff76d8c0 T0) #0 0x7f1450d3b64c (/home/icy/secreal/libsass-asan/install/lib/libsass.so.1+0x53664c) #1 0x7f1450d3a3e2 (/home/icy/secreal/libsass-asan/install/lib/libsass.so.1+0x5353e2) #2 0x7f1450d3feaa (/home/icy/secreal/libsass-asan/install/lib/libsass.so.1+0x53aeaa) #3 0x7f1450d3a14e (/home/icy/secreal/libsass-asan/install/lib/libsass.so.1+0x53514e) #4 0x7f1450daba49 (/home/icy/secreal/libsass-asan/install/lib/libsass.so.1+0x5a6a49) #5 0x7f1450dcf9da (/home/icy/secreal/libsass-asan/install/lib/libsass.so.1+0x5ca9da) #6 0x7f1450d9d71a (/home/icy/secreal/libsass-asan/install/lib/libsass.so.1+0x59871a) #7 0x7f1450a931aa (/home/icy/secreal/libsass-asan/install/lib/libsass.so.1+0x28e1aa) #8 0x7f1450a8e3b3 (/home/icy/secreal/libsass-asan/install/lib/libsass.so.1+0x2893b3) #9 0x7f1450f9fe60 (/home/icy/secreal/libsass-asan/install/lib/libsass.so.1+0x79ae60) #10 0x7f1450f9eaa1 (/home/icy/secreal/libsass-asan/install/lib/libsass.so.1+0x799aa1) #11 0x7f1450f9eee1 (/home/icy/secreal/libsass-asan/install/lib/libsass.so.1+0x799ee1) #12 0x4ddfc5 (/home/icy/secreal/sassc-asan/install/bin/sassc+0x4ddfc5) #13 0x4debe5 (/home/icy/secreal/sassc-asan/install/bin/sassc+0x4debe5) #14 0x7f144f590a3f (/lib/x86_64-linux-gnu/libc.so.6+0x20a3f) #15 0x436508 (/home/icy/secreal/sassc-asan/install/bin/sassc+0x436508) AddressSanitizer can not provide additional info. ==31154==ABORTING Actual results: crash Expected results: crash Additional info: Credits: This vulnerability is detected by team OWL337, with our custom fuzzer collAFL. Please contact ganshuitao and chaoz.cn if you need more info about the team, the tool or the vulnerability.