Package: release.debian.org Severity: normal User: release.debian....@packages.debian.org Usertags: unblock X-Debbugs-Cc: debian-tex-ma...@lists.debian.org
Please unblock package texlive-bin [ Reason ] Several fixes for shell escape exploits recently reported on the private TeX Live security list have been fixed. (No CVE or bug numbers are available) [ Impact ] TeX programs (like (la)tex, pdf(la)tex, lua(la)tex etc have a "restricted" mode for calling external programs, where only a specific set of vetted for programs are allowed. Without these fixes it will be rather easy to call arbitrary programs from tex/luatex/etc even when those programs run in restricted mode (which is the default setup). Another fix that is in this patch is for xdvi which didn't quote '&' before passing it to the shell to start a program, which again allowed for arbitrary program execution. [ Tests ] All exploits have been tested before and after the fix. On request I will send the exploit code. [ Risks ] One fix that has been done is that in restricted mode, luatex does not allow putenv (change of environment variables) anymore, because this would allow PATH changes, and thus circumvention of restricted mode setting. Some packages might use putenv (lua) on purpose and good way, which might be broken when run in restricted mode, although we (that is upstream TeX Live as well as the Debian team) are not aware of any. [ Checklist ] [X] all changes are documented in the d/changelog [X] I reviewed all changes and I approve them I made them and backported them [X] attach debdiff against the package in testing I attach the three patches added to the patch queue in debian/patches. All other changes are just changelog entry and one patch renaming for consistency. All the code changes are attached. unblock texlive-bin/2020.20200327.54578-7 Norbert -- PREINING Norbert https://www.preining.info Fujitsu Research Labs + IFMGA Guide + TU Wien + TeX Live + Debian Dev GPG: 0x860CDC13 fp: F7D8 A928 26E3 16A1 9FA0 ACF0 6CAC A448 860C DC13
--- texk/web2c/lib/texmfmp.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) --- a/texk/web2c/lib/texmfmp.c +++ b/texk/web2c/lib/texmfmp.c @@ -606,8 +606,18 @@ runsystem (const char *cmd) if (allow == 1) status = system (cmd); - else if (allow == 2) + else if (allow == 2) { +/* + command including a character '|' is not allowed in + restricted mode for security. +*/ + size_t k; + for (k = 0; k < strlen (safecmd); k++) { + if (safecmd[k] == '|') + return 0; + } status = system (safecmd); + } /* Not really meaningful, but we have to manage the return value of system. */ if (status != 0)
--- texk/web2c/luatexdir/lua/luatex-core.c | 626 +++++----- texk/web2c/luatexdir/lua/luatex-core.lua | 3 texk/web2c/luatexdir/luafontloader/fontforge/fontforge/splinefont.c | 10 3 files changed, 326 insertions(+), 313 deletions(-) --- a/texk/web2c/luatexdir/lua/luatex-core.lua +++ b/texk/web2c/luatexdir/lua/luatex-core.lua @@ -198,6 +198,9 @@ if saferoption == 1 or shellescape ~= 1 package.searchers[4] = nil package.searchers[3] = nil + if os.setenv then + os.setenv = function(...) end + end ffi = require('ffi') if ffi then --- a/texk/web2c/luatexdir/luafontloader/fontforge/fontforge/splinefont.c +++ b/texk/web2c/luatexdir/luafontloader/fontforge/fontforge/splinefont.c @@ -246,6 +246,12 @@ char *Decompress(char *name, int compres char buf[1500]; char *tmpfile; + if ( strchr(name,'$') || strchr(name,'!') || strchr(name,'*') || strchr(name,'?') + || strchr(name,'[') || strchr(name,'[') || strchr(name,']') || strchr(name,']') + || strchr(name,';') || strchr(name,'&') || strchr(name,'>') || strchr(name,'<') + || strchr(name,'`') || strchr(name,'"') || strchr(name,'|') || strchr(name,'\'') + || strchr(name,'\\')) +return( NULL ); if ( dir==NULL ) dir = P_tmpdir; tmpfile = galloc(strlen(dir)+strlen(GFileNameTail(name))+2); strcpy(tmpfile,dir); @@ -253,9 +259,9 @@ char *Decompress(char *name, int compres strcat(tmpfile,GFileNameTail(name)); *strrchr(tmpfile,'.') = '\0'; #if defined( _NO_SNPRINTF ) || defined( __VMS ) - sprintf( buf, "%s < %s > %s", compressors[compression].decomp, name, tmpfile ); + sprintf( buf, "%s < \"%s\" > \"%s\"", compressors[compression].decomp, name, tmpfile ); #else - snprintf( buf, sizeof(buf), "%s < %s > %s", compressors[compression].decomp, name, tmpfile ); + snprintf( buf, sizeof(buf), "%s < \"%s\" > \"%s\"", compressors[compression].decomp, name, tmpfile ); #endif if ( system(buf)==0 ) return( tmpfile ); --- a/texk/web2c/luatexdir/lua/luatex-core.c +++ b/texk/web2c/luatexdir/lua/luatex-core.c @@ -356,321 +356,325 @@ int load_luatex_core_lua 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--- texk/xdvik/string-utils.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/texk/xdvik/string-utils.c +++ b/texk/xdvik/string-utils.c @@ -636,7 +636,7 @@ canonicalize_path(const char *path) } /* Escape all of the following characters in str: - ` \ ; ( ) + ` \ ; ( ) & making it safe to pass str to a shell. Return result in a newly allocated string, which the caller is responsible to free() after use. */ @@ -653,6 +653,7 @@ shell_escape_string(const char *str) || *src_ptr == '`' || *src_ptr == '(' || *src_ptr == ')' + || *src_ptr == '&' || *src_ptr == ';') { #if 0 /* only if not yet escaped? */