Accepting request 838838 from GNOME:Next
- Add libproxy-CVE-2020-25219.patch: Rewrite url::recvline to be nonrecursive (boo#1176410 CVE-2020-25219). - Add libproxy-fix-pac-buffer-overflow.patch: fix buffer overflow when PAC is enabled (boo#1177143 CVE-2020-26154). OBS-URL: https://build.opensuse.org/request/show/838838 OBS-URL: https://build.opensuse.org/package/show/GNOME:Factory/libproxy?expand=0&rev=152
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60
libproxy-CVE-2020-25219.patch
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60
libproxy-CVE-2020-25219.patch
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@ -0,0 +1,60 @@
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From a83dae404feac517695c23ff43ce1e116e2bfbe0 Mon Sep 17 00:00:00 2001
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From: Michael Catanzaro <mcatanzaro@gnome.org>
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Date: Wed, 9 Sep 2020 11:12:02 -0500
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Subject: [PATCH] Rewrite url::recvline to be nonrecursive
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This function processes network input. It's semi-trusted, because the
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PAC ought to be trusted. But we still shouldn't allow it to control how
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far we recurse. A malicious PAC can cause us to overflow the stack by
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sending a sufficiently-long line without any '\n' character.
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Also, this function failed to properly handle EINTR, so let's fix that
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too, for good measure.
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Fixes #134
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---
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libproxy/url.cpp | 28 ++++++++++++++++++----------
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1 file changed, 18 insertions(+), 10 deletions(-)
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diff --git a/libproxy/url.cpp b/libproxy/url.cpp
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index ee776b2..68d69cd 100644
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--- a/libproxy/url.cpp
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+++ b/libproxy/url.cpp
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@@ -388,16 +388,24 @@ string url::to_string() const {
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return m_orig;
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}
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-static inline string recvline(int fd) {
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- // Read a character.
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- // If we don't get a character, return empty string.
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- // If we are at the end of the line, return empty string.
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- char c = '\0';
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-
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- if (recv(fd, &c, 1, 0) != 1 || c == '\n')
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- return "";
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-
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- return string(1, c) + recvline(fd);
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+static string recvline(int fd) {
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+ string line;
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+ int ret;
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+
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+ // Reserve arbitrary amount of space to avoid small memory reallocations.
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+ line.reserve(128);
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+
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+ do {
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+ char c;
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+ ret = recv(fd, &c, 1, 0);
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+ if (ret == 1) {
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+ if (c == '\n')
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+ return line;
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+ line += c;
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+ }
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+ } while (ret == 1 || (ret == -1 && errno == EINTR));
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+
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+ return line;
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}
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char* url::get_pac() {
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--
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2.28.0
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93
libproxy-fix-pac-buffer-overflow.patch
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93
libproxy-fix-pac-buffer-overflow.patch
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From 4411b523545b22022b4be7d0cac25aa170ae1d3e Mon Sep 17 00:00:00 2001
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From: Fei Li <lifeibiren@gmail.com>
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Date: Fri, 17 Jul 2020 02:18:37 +0800
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Subject: [PATCH] Fix buffer overflow when PAC is enabled
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The bug was found on Windows 10 (MINGW64) when PAC is enabled. It turned
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out to be the large PAC file (more than 102400 bytes) returned by a
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local proxy program with no content-length present.
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---
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libproxy/url.cpp | 44 +++++++++++++++++++++++++++++++-------------
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1 file changed, 31 insertions(+), 13 deletions(-)
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diff --git a/libproxy/url.cpp b/libproxy/url.cpp
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index ee776b2..8684086 100644
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--- a/libproxy/url.cpp
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+++ b/libproxy/url.cpp
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@@ -54,7 +54,7 @@ using namespace std;
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#define PAC_MIME_TYPE_FB "text/plain"
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// This is the maximum pac size (to avoid memory attacks)
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-#define PAC_MAX_SIZE 102400
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+#define PAC_MAX_SIZE 0x800000
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// This is the default block size to use when receiving via HTTP
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#define PAC_HTTP_BLOCK_SIZE 512
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@@ -478,15 +478,13 @@ char* url::get_pac() {
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}
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// Get content
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- unsigned int recvd = 0;
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- buffer = new char[PAC_MAX_SIZE];
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- memset(buffer, 0, PAC_MAX_SIZE);
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+ std::vector<char> dynamic_buffer;
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do {
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unsigned int chunk_length;
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if (chunked) {
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// Discard the empty line if we received a previous chunk
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- if (recvd > 0) recvline(sock);
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+ if (!dynamic_buffer.empty()) recvline(sock);
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// Get the chunk-length line as an integer
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if (sscanf(recvline(sock).c_str(), "%x", &chunk_length) != 1 || chunk_length == 0) break;
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@@ -498,21 +496,41 @@ char* url::get_pac() {
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if (content_length >= PAC_MAX_SIZE) break;
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- while (content_length == 0 || recvd != content_length) {
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- int r = recv(sock, buffer + recvd,
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- content_length == 0 ? PAC_HTTP_BLOCK_SIZE
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- : content_length - recvd, 0);
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+ while (content_length == 0 || dynamic_buffer.size() != content_length) {
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+ // Calculate length to recv
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+ unsigned int length_to_read = PAC_HTTP_BLOCK_SIZE;
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+ if (content_length > 0)
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+ length_to_read = content_length - dynamic_buffer.size();
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+
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+ // Prepare buffer
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+ dynamic_buffer.resize(dynamic_buffer.size() + length_to_read);
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+
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+ int r = recv(sock, dynamic_buffer.data() + dynamic_buffer.size() - length_to_read, length_to_read, 0);
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+
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+ // Shrink buffer to fit
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+ if (r >= 0)
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+ dynamic_buffer.resize(dynamic_buffer.size() - length_to_read + r);
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+
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+ // PAC size too large, discard
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+ if (dynamic_buffer.size() >= PAC_MAX_SIZE) {
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+ chunked = false;
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+ dynamic_buffer.clear();
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+ break;
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+ }
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+
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if (r <= 0) {
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chunked = false;
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break;
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}
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- recvd += r;
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}
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} while (chunked);
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- if (content_length != 0 && string(buffer).size() != content_length) {
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- delete[] buffer;
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- buffer = NULL;
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+ if (content_length == 0 || content_length == dynamic_buffer.size()) {
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+ buffer = new char[dynamic_buffer.size() + 1];
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+ if (!dynamic_buffer.empty()) {
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+ memcpy(buffer, dynamic_buffer.data(), dynamic_buffer.size());
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+ }
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+ buffer[dynamic_buffer.size()] = '\0';
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}
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}
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@ -1,3 +1,11 @@
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-------------------------------------------------------------------
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Wed Sep 30 18:50:44 UTC 2020 - Michael Gorse <mgorse@suse.com>
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- Add libproxy-CVE-2020-25219.patch: Rewrite url::recvline to be
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nonrecursive (boo#1176410 CVE-2020-25219).
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- Add libproxy-fix-pac-buffer-overflow.patch: fix buffer overflow
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when PAC is enabled (boo#1177143 CVE-2020-26154).
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-------------------------------------------------------------------
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Fri Sep 14 02:58:52 UTC 2020 - Yifan Jiang <yfjiang@suse.com>
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@ -51,6 +51,10 @@ Source99: baselibs.conf
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Patch0: libproxy-python3.7.patch
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# PATCH-FIX-UPSTREAM libproxy-pxgsettings.patch dimstar@opensuse.org -- pxgsettings: use the correct syntax to connect to the changed signal
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Patch1: libproxy-pxgsettings.patch
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# PATCH-FIX-UPSTREAM libproxy-CVE-2020-25219.patch boo#1176410 mgorse@suse.com -- Rewrite url::recvline to be nonrecursive.
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Patch2: libproxy-CVE-2020-25219.patch
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# PATCH-FIX-UPSTREAM libproxy-fix-pac-buffer-overflow.patch boo#1177143 mgorse@suse.com -- fix buffer overflow when PAC is enabled.
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Patch3: libproxy-fix-pac-buffer-overflow.patch
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BuildRequires: cmake
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BuildRequires: gcc-c++
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BuildRequires: libmodman-devel
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@ -276,6 +280,8 @@ This package contains the Mono/.NET for libproxy.
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%setup -q -n %{_sourcename}
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%patch0 -p1
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%patch1 -p1
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%patch2 -p1
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%patch3 -p1
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mkdir build
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%build
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