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gnu: upx: Fix CVE-2017-15056.

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* gnu/packages/patches/upx-protect-against-bad-crafted-input.patch: New file.
* gnu/packages/compression.scm (upx)[source]: Use it.
* gnu/local.mk (dist_patch_DATA): Add it.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
Pierre Neidhardt 2018-06-16 16:54:53 +02:00 committed by Ludovic Courtès
parent ed2ae0dc7f
commit a14de83213
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GPG key ID: 090B11993D9AEBB5
3 changed files with 104 additions and 1 deletions
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1
gnu/local.mk
View file

@ -1157,6 +1157,7 @@ dist_patch_DATA = \
%D%/packages/patches/ustr-fix-build-with-gcc-5.patch \
%D%/packages/patches/util-linux-tests.patch \
%D%/packages/patches/upower-builddir.patch \
%D%/packages/patches/upx-fix-CVE-2017-15056.patch \
%D%/packages/patches/valgrind-enable-arm.patch \
%D%/packages/patches/valgrind-glibc-compat.patch \
%D%/packages/patches/vinagre-revert-1.patch \

8
gnu/packages/compression.scm
View file

@ -2209,7 +2209,8 @@ (define-public upx
version "/" name "-" version "-src.tar.xz"))
(sha256
(base32
"08anybdliqsbsl6x835iwzljahnm9i7v26icdjkcv33xmk6p5vw1"))))
"08anybdliqsbsl6x835iwzljahnm9i7v26icdjkcv33xmk6p5vw1"))
(patches (search-patches "upx-fix-CVE-2017-15056.patch"))))
(build-system gnu-build-system)
(native-inputs `(("perl" ,perl)
("ucl" ,ucl)))
@ -2241,6 +2242,11 @@ (define-public upx
#t))
)))
(home-page "https://upx.github.io/")
;; CVE-2017-16869 is about Mach-O files which is not of a big concern for Guix.
;; See https://github.com/upx/upx/issues/146 and
;; https://nvd.nist.gov/vuln/detail?vulnId=CVE-2017-16869.
;; The issue will be fixed after version 3.94.
(properties `((lint-hidden-cve . ("CVE-2017-16869"))))
(synopsis "Compression tool for executables")
(description
"The Ultimate Packer for eXecutables (UPX) is an executable file

96
gnu/packages/patches/upx-fix-CVE-2017-15056.patch Normal file
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@ -0,0 +1,96 @@
From 3e0c2966dffb5dadb512a476ef4be3d0cc51c2be Mon Sep 17 00:00:00 2001
From: Pierre Neidhardt <ambrevar@gmail.com>
Date: Sat, 16 Jun 2018 16:35:00 +0200
Subject: [PATCH] Protect against bad crafted input
Also check for wrap-around when checking oversize involving e_shoff and e_shnum.
raised by https://github.com/upx/upx/pull/190
modified: p_lx_elf.cpp
---
src/p_lx_elf.cpp | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/src/p_lx_elf.cpp b/src/p_lx_elf.cpp
index 822a7652..41e805ee 100644
--- a/src/p_lx_elf.cpp
+++ b/src/p_lx_elf.cpp
@@ -235,8 +235,17 @@ PackLinuxElf32::PackLinuxElf32help1(InputFile *f)
sz_phdrs = 0;
return;
}
+ if (0==e_phnum) throwCantUnpack("0==e_phnum");
e_phoff = get_te32(&ehdri.e_phoff);
+ unsigned const last_Phdr = e_phoff + e_phnum * sizeof(Elf32_Phdr);
+ if (last_Phdr < e_phoff || (unsigned long)file_size < last_Phdr) {
+ throwCantUnpack("bad e_phoff");
+ }
e_shoff = get_te32(&ehdri.e_shoff);
+ unsigned const last_Shdr = e_shoff + e_shnum * sizeof(Elf32_Shdr);
+ if (last_Shdr < e_shoff || (unsigned long)file_size < last_Shdr) {
+ throwCantUnpack("bad e_shoff");
+ }
sz_phdrs = e_phnum * e_phentsize;
if (f && Elf32_Ehdr::ET_DYN!=e_type) {
@@ -599,8 +608,17 @@ PackLinuxElf64::PackLinuxElf64help1(InputFile *f)
sz_phdrs = 0;
return;
}
+ if (0==e_phnum) throwCantUnpack("0==e_phnum");
e_phoff = get_te64(&ehdri.e_phoff);
+ upx_uint64_t const last_Phdr = e_phoff + e_phnum * sizeof(Elf64_Phdr);
+ if (last_Phdr < e_phoff || (unsigned long)file_size < last_Phdr) {
+ throwCantUnpack("bad e_phoff");
+ }
e_shoff = get_te64(&ehdri.e_shoff);
+ upx_uint64_t const last_Shdr = e_shoff + e_shnum * sizeof(Elf64_Shdr);
+ if (last_Shdr < e_shoff || (unsigned long)file_size < last_Shdr) {
+ throwCantUnpack("bad e_shoff");
+ }
sz_phdrs = e_phnum * e_phentsize;
if (f && Elf64_Ehdr::ET_DYN!=e_type) {
@@ -3763,6 +3781,9 @@ void PackLinuxElf64::pack4(OutputFile *fo, Filter &ft)
void PackLinuxElf64::unpack(OutputFile *fo)
{
+ if (e_phoff != sizeof(Elf64_Ehdr)) {// Phdrs not contiguous with Ehdr
+ throwCantUnpack("bad e_phoff");
+ }
unsigned const c_phnum = get_te16(&ehdri.e_phnum);
upx_uint64_t old_data_off = 0;
upx_uint64_t old_data_len = 0;
@@ -3828,6 +3849,9 @@ void PackLinuxElf64::unpack(OutputFile *fo)
unsigned total_out = 0;
unsigned c_adler = upx_adler32(NULL, 0);
unsigned u_adler = upx_adler32(NULL, 0);
+ if ((MAX_ELF_HDR - sizeof(Elf64_Ehdr))/sizeof(Elf64_Phdr) < u_phnum) {
+ throwCantUnpack("bad compressed e_phnum");
+ }
// Packed ET_EXE has no PT_DYNAMIC.
// Packed ET_DYN has original PT_DYNAMIC for info needed by rtld.
@@ -4383,6 +4407,9 @@ Elf64_Sym const *PackLinuxElf64::elf_lookup(char const *name) const
void PackLinuxElf32::unpack(OutputFile *fo)
{
+ if (e_phoff != sizeof(Elf32_Ehdr)) {// Phdrs not contiguous with Ehdr
+ throwCantUnpack("bad e_phoff");
+ }
unsigned const c_phnum = get_te16(&ehdri.e_phnum);
unsigned old_data_off = 0;
unsigned old_data_len = 0;
@@ -4449,6 +4476,9 @@ void PackLinuxElf32::unpack(OutputFile *fo)
unsigned total_out = 0;
unsigned c_adler = upx_adler32(NULL, 0);
unsigned u_adler = upx_adler32(NULL, 0);
+ if ((MAX_ELF_HDR - sizeof(Elf32_Ehdr))/sizeof(Elf32_Phdr) < u_phnum) {
+ throwCantUnpack("bad compressed e_phnum");
+ }
// Packed ET_EXE has no PT_DYNAMIC.
// Packed ET_DYN has original PT_DYNAMIC for info needed by rtld.
--
2.17.0