xbuf_format_converter, used as part of exif_read_data, was appending a terminating null character to the generated string, but was not using its standard append char function. As a result, if the buffer was full, it would result in an out-of-bounds write. This issue affects HHVM versions prior to 4.56.3, all versions between 4.57.0 and 4.80.1, all versions between 4.81.0 and 4.93.1, and versions 4.94.0, 4.95.0, 4.96.0, 4.97.0, 4.98.0.
[
{
"product": "HHVM",
"vendor": "Facebook",
"versions": [
{
"lessThan": "unspecified",
"status": "unaffected",
"version": "4.98.1",
"versionType": "custom"
},
{
"status": "affected",
"version": "4.98.0"
},
{
"lessThan": "unspecified",
"status": "unaffected",
"version": "4.97.1",
"versionType": "custom"
},
{
"status": "affected",
"version": "4.97.0"
},
{
"lessThan": "unspecified",
"status": "unaffected",
"version": "4.96.1",
"versionType": "custom"
},
{
"status": "affected",
"version": "4.96.0"
},
{
"lessThan": "unspecified",
"status": "unaffected",
"version": "4.95.1",
"versionType": "custom"
},
{
"status": "affected",
"version": "4.95.0"
},
{
"lessThan": "unspecified",
"status": "unaffected",
"version": "4.94.1",
"versionType": "custom"
},
{
"status": "affected",
"version": "4.94.0"
},
{
"lessThan": "unspecified",
"status": "unaffected",
"version": "4.93.2",
"versionType": "custom"
},
{
"lessThan": "unspecified",
"status": "affected",
"version": "4.81.0",
"versionType": "custom"
},
{
"lessThan": "unspecified",
"status": "unaffected",
"version": "4.80.2",
"versionType": "custom"
},
{
"lessThan": "unspecified",
"status": "affected",
"version": "4.57.0",
"versionType": "custom"
},
{
"lessThan": "unspecified",
"status": "unaffected",
"version": "4.56.3",
"versionType": "custom"
},
{
"lessThan": "4.56.3",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
]