CVE-2017-14040 (published 2017-08-30T22:29Z)

An invalid write access was discovered in bin/jp2/convert.c in OpenJPEG 2.2.0, triggering a crash in the tgatoimage function. The vulnerability may lead to remote denial of service or possibly unspecified other impact.

Severity: MEDIUM
CVSS v2 base score: 6.8 (AV:N/AC:M/Au:N/C:P/I:P/A:P)
CVSS v3 base score: 8.8, HIGH (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)

Weakness information:
cwe_id: CWE-787
cwe_name: Out-of-bounds Write
description: The product writes data past the end, or before the beginning, of the intended buffer.
extended_description: 
            
            
             
			 
         
         

Fix information:
repo_url: https://github.com/uclouvain/openjpeg
commit_details: repo_url: https://github.com/uclouvain/openjpeg
author: Even Rouault
author_date: 2017-08-17 11:47:40+02:00
msg: tgatoimage(): avoid excessive memory allocation attempt, and fixes unaligned load (#995)
repository: repo_url: https://github.com/uclouvain/openjpeg
repo_name: uclouvain/openjpeg
description: Official repository of the OpenJPEG project
repo_language: C
owner: uclouvain
file_changes: filename: convert.c
change_type: ModificationType.MODIFY
diff: @@ -580,13 +580,10 @@ struct tga_header {
 };
 #endif /* INFORMATION_ONLY */
 
-static unsigned short get_ushort(const unsigned char *data)
+/* Returns a ushort from a little-endian serialized value */
+static unsigned short get_tga_ushort(const unsigned char *data)
 {
-    unsigned short val = *(const unsigned short *)data;
-#ifdef OPJ_BIG_ENDIAN
-    val = ((val & 0xffU) << 8) | (val >> 8);
-#endif
-    return val;
+    return data[0] | (data[1] << 8);
 }
 
 #define TGA_HEADER_SIZE 18
@@ -613,17 +610,17 @@ static int tga_readheader(FILE *fp, unsigned int *bits_per_pixel,
     id_len = tga[0];
     /*cmap_type = tga[1];*/
     image_type = tga[2];
-    /*cmap_index = get_ushort(&tga[3]);*/
-    cmap_len = get_ushort(&tga[5]);
+    /*cmap_index = get_tga_ushort(&tga[3]);*/
+    cmap_len = get_tga_ushort(&tga[5]);
     cmap_entry_size = tga[7];
 
 
 #if 0
-    x_origin = get_ushort(&tga[8]);
-    y_origin = get_ushort(&tga[10]);
+    x_origin = get_tga_ushort(&tga[8]);
+    y_origin = get_tga_ushort(&tga[10]);
 #endif
-    image_w = get_ushort(&tga[12]);
-    image_h = get_ushort(&tga[14]);
+    image_w = get_tga_ushort(&tga[12]);
+    image_h = get_tga_ushort(&tga[14]);
     pixel_depth = tga[16];
     image_desc  = tga[17];
 
@@ -817,6 +814,24 @@ opj_image_t* tgatoimage(const char *filename, opj_cparameters_t *parameters)
         color_space = OPJ_CLRSPC_SRGB;
     }
 
+    /* If the declared file size is > 10 MB, check that the file is big */
+    /* enough to avoid excessive memory allocations */
+    if (image_height != 0 && image_width > 10000000 / image_height / numcomps) {
+        char ch;
+        OPJ_UINT64 expected_file_size =
+            (OPJ_UINT64)image_width * image_height * numcomps;
+        long curpos = ftell(f);
+        if (expected_file_size > (OPJ_UINT64)INT_MAX) {
+            expected_file_size = (OPJ_UINT64)INT_MAX;
+        }
+        fseek(f, (long)expected_file_size - 1, SEEK_SET);
+        if (fread(&ch, 1, 1, f) != 1) {
+            fclose(f);
+            return NULL;
+        }
+        fseek(f, curpos, SEEK_SET);
+    }
+
     subsampling_dx = parameters->subsampling_dx;
     subsampling_dy = parameters->subsampling_dy;
 

programming_language: C++