backpack/crud is vulnerable to Cross-Site Scripting (XSS)
The advisory, in context
Impact
It’s a “moderate” vulnerability… but being an admin panel, take this seriously. It’s difficult… but an attacker could conduct a targeted phishing campaign, in order to trick your users or admins to click a malicious link, which under very specific circumstances could give them information... or even admin access. It’s unlikely, but that’s not good enough in admin panels - It should be made impossible. That’s why you are bothered with this.
Patches
If you don’t have custom error views, the views provided by Backpack would output the exception message without escaping it, which made an attack possible using Reflected XSS, in some very specific circumstances (that we will not disclose). To fix those error views in Backpack 4.x and 5.x, please run:
composer update backpack/crud
php artisan backpack:fix
The problem has been patched in:
- v4.0.63
- v4.1.69
- v5.0.13
IMPORTANT! Running a
composer updateshould get you the patched version, but you also need to runphp artisan backpack:fixafterwards, to patch your published error views, if necessary.
Workarounds
Alternatively (if you don’t want to run composer update), you can manually look inside your error views in “resources/views/errors” and output e($exception->getMessage()) instead of $exception->getMessage(). That’s all there is to the fix, really.
What the maintainers have done about this
Acted as soon as our team found it (last week of March 2022):
- Pushed patches to 5.x, 4.1 and 4.0;
- Made it easy to apply the fix to existing projects, using a new
php artisan backpack:fixcommand; - Kept the specific circumstances a secret; as far as they know, only the maintainer's team knows about the niche case where this exploit is possible;
- Emailed all our licensed users, to have a chance to fix their projects before it’s public;
- Sent an email blast to our 25.000+ strong Security Newsletter;
- Made this public with a blog post and soon a CVE, after our community has had a reasonable chance to fix their projects;
- Will continue to monitor this and remind paying users to apply this fix if they haven’t;
For more information
If you have any questions or comments about this advisory:
- Open an issue in backpack/crud
- Email us at hello@backpackforlaravel.com
PS. You can read this blog post for more information.
Affected packages
Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.
From 5.0.0 before 5.0.13
Fixed in 5.0.13
13 explicitly affected versions
5.0.0, 5.0.1, 5.0.10, 5.0.11, 5.0.12, 5.0.2, 5.0.3, 5.0.4, 5.0.5, 5.0.6, 5.0.7, 5.0.8, 5.0.9
View affected-version evidence
{
"ranges": [
{
"events": [
{
"introduced": "5.0.0"
},
{
"fixed": "5.0.13"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.0.0",
"5.0.1",
"5.0.10",
"5.0.11",
"5.0.12",
"5.0.2",
"5.0.3",
"5.0.4",
"5.0.5",
"5.0.6",
"5.0.7",
"5.0.8",
"5.0.9"
]
}From 4.1.0 before 4.1.69
Fixed in 4.1.69
69 explicitly affected versions
4.1.0, 4.1.1, 4.1.10, 4.1.11, 4.1.12, 4.1.13, 4.1.14, 4.1.15, 4.1.16, 4.1.17, 4.1.18, 4.1.19, 4.1.2, 4.1.20, 4.1.21, 4.1.22, 4.1.23, 4.1.24, 4.1.25, 4.1.26, 4.1.27, 4.1.28, 4.1.29, 4.1.3, 4.1.30, 4.1.31, 4.1.32, 4.1.33, 4.1.34, 4.1.35, 4.1.36, 4.1.37, 4.1.38, 4.1.39, 4.1.4, 4.1.40, 4.1.41, 4.1.42, 4.1.43, 4.1.44, 4.1.45, 4.1.46, 4.1.47, 4.1.48, 4.1.49, 4.1.5, 4.1.50, 4.1.51, 4.1.52, 4.1.53, 4.1.54, 4.1.55, 4.1.56, 4.1.57, 4.1.58, 4.1.59, 4.1.6, 4.1.60, 4.1.61, 4.1.62, 4.1.63, 4.1.64, 4.1.65, 4.1.66, 4.1.67, 4.1.68, 4.1.7, 4.1.8, 4.1.9
View affected-version evidence
{
"ranges": [
{
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"introduced": "4.1.0"
},
{
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}
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"4.1.1",
"4.1.10",
"4.1.11",
"4.1.12",
"4.1.13",
"4.1.14",
"4.1.15",
"4.1.16",
"4.1.17",
"4.1.18",
"4.1.19",
"4.1.2",
"4.1.20",
"4.1.21",
"4.1.22",
"4.1.23",
"4.1.24",
"4.1.25",
"4.1.26",
"4.1.27",
"4.1.28",
"4.1.29",
"4.1.3",
"4.1.30",
"4.1.31",
"4.1.32",
"4.1.33",
"4.1.34",
"4.1.35",
"4.1.36",
"4.1.37",
"4.1.38",
"4.1.39",
"4.1.4",
"4.1.40",
"4.1.41",
"4.1.42",
"4.1.43",
"4.1.44",
"4.1.45",
"4.1.46",
"4.1.47",
"4.1.48",
"4.1.49",
"4.1.5",
"4.1.50",
"4.1.51",
"4.1.52",
"4.1.53",
"4.1.54",
"4.1.55",
"4.1.56",
"4.1.57",
"4.1.58",
"4.1.59",
"4.1.6",
"4.1.60",
"4.1.61",
"4.1.62",
"4.1.63",
"4.1.64",
"4.1.65",
"4.1.66",
"4.1.67",
"4.1.68",
"4.1.7",
"4.1.8",
"4.1.9"
]
}Earlier releases before 4.0.63
Fixed in 4.0.63
349 explicitly affected versions
0.4.1, 0.5.0, 0.5.1, 0.5.10, 0.5.9, 0.6.0, 0.6.1, 0.6.2, 0.6.3, 0.6.4, 0.6.5, 0.7, 0.7.1, 0.7.2, 0.7.3, 0.7.4, 0.7.5, 0.7.6, 0.7.7, 0.7.8, 0.7.9, 0.8.0, 0.8.1, 0.8.10, 0.8.11, 0.8.12, 0.8.13, 0.8.14, 0.8.15, 0.8.16, 0.8.17, 0.8.18, 0.8.2, 0.8.3, 0.8.4, 0.8.5, 0.8.6, 0.8.7, 0.8.8, 0.8.9, 0.9.0, 0.9.1, 0.9.10, 0.9.2, 0.9.3, 0.9.4, 0.9.5, 0.9.6, 0.9.7, 0.9.8, 0.9.9, 2.0.0, 2.0.1, 2.0.10, 2.0.11, 2.0.12, 2.0.13, 2.0.14, 2.0.15, 2.0.16, 2.0.17, 2.0.18, 2.0.19, 2.0.2, 2.0.20, 2.0.21, 2.0.22, 2.0.23, 2.0.24, 2.0.4, 2.0.5, 2.0.6, 2.0.7, 2.0.8, 2.0.9, 3.0.0, 3.0.1, 3.0.10, 3.0.11, 3.0.12, 3.0.13, 3.0.14, 3.0.15, 3.0.16, 3.0.18, 3.0.2, 3.0.3, 3.0.4, 3.0.5, 3.0.6, 3.0.7, 3.0.8, 3.0.9, 3.1.0, 3.1.1, 3.1.10, 3.1.11, 3.1.12, 3.1.13, 3.1.14, 3.1.15, 3.1.16, 3.1.17, 3.1.18, 3.1.19, 3.1.2, 3.1.20, 3.1.21, 3.1.22, 3.1.23, 3.1.24, 3.1.25, 3.1.26, 3.1.28, 3.1.29, 3.1.3, 3.1.30, 3.1.31, 3.1.32, 3.1.33, 3.1.34, 3.1.35, 3.1.36, 3.1.37, 3.1.38, 3.1.39, 3.1.4, 3.1.40, 3.1.41, 3.1.42, 3.1.43, 3.1.44, 3.1.45, 3.1.46, 3.1.47, 3.1.48, 3.1.49, 3.1.5, 3.1.50, 3.1.51, 3.1.52, 3.1.53, 3.1.54, 3.1.55, 3.1.56, 3.1.57, 3.1.58, 3.1.59, 3.1.6, 3.1.60, 3.1.7, 3.1.8, 3.1.9, 3.2.0, 3.2.1, 3.2.10, 3.2.11, 3.2.12, 3.2.13, 3.2.14, 3.2.15, 3.2.16, 3.2.17, 3.2.18, 3.2.19, 3.2.2, 3.2.20, 3.2.21, 3.2.22, 3.2.23, 3.2.24, 3.2.25, 3.2.26, 3.2.27, 3.2.3, 3.2.4, 3.2.5, 3.2.6, 3.2.7, 3.2.9, 3.3.0, 3.3.1, 3.3.10, 3.3.11, 3.3.12, 3.3.13, 3.3.14, 3.3.15, 3.3.16, 3.3.17, 3.3.2, 3.3.3, 3.3.4, 3.3.5, 3.3.6, 3.3.7, 3.3.8, 3.3.9, 3.4.0, 3.4.1, 3.4.10, 3.4.11, 3.4.12, 3.4.13, 3.4.14, 3.4.15, 3.4.16, 3.4.17, 3.4.18, 3.4.19, 3.4.2, 3.4.20, 3.4.21, 3.4.22, 3.4.23, 3.4.24, 3.4.25, 3.4.26, 3.4.27, 3.4.28, 3.4.29, 3.4.3, 3.4.30, 3.4.31, 3.4.32, 3.4.33, 3.4.34, 3.4.35, 3.4.36, 3.4.37, 3.4.38, 3.4.39, 3.4.4, 3.4.40, 3.4.41, 3.4.42, 3.4.43, 3.4.5, 3.4.6, 3.4.7, 3.4.8, 3.4.9, 3.5.1, 3.5.10, 3.5.11, 3.5.12, 3.5.13, 3.5.14, 3.5.2, 3.5.3, 3.5.4, 3.5.5, 3.5.6, 3.5.7, 3.5.8, 3.5.9, 3.6.1, 3.6.10, 3.6.11, 3.6.12, 3.6.13, 3.6.14, 3.6.15, 3.6.16, 3.6.17, 3.6.18, 3.6.19, 3.6.2, 3.6.20, 3.6.21, 3.6.22, 3.6.24, 3.6.25, 3.6.26, 3.6.27, 3.6.28, 3.6.29, 3.6.3, 3.6.30, 3.6.31, 3.6.32, 3.6.33, 3.6.4, 3.6.5, 3.6.6, 3.6.7, 3.6.8, 3.6.9, 4.0.0, 4.0.1, 4.0.10, 4.0.11, 4.0.12, 4.0.13, 4.0.14, 4.0.15, 4.0.16, 4.0.17, 4.0.18, 4.0.19, 4.0.2, 4.0.20, 4.0.21, 4.0.22, 4.0.23, 4.0.24, 4.0.25, 4.0.26, 4.0.27, 4.0.28, 4.0.29, 4.0.3, 4.0.30, 4.0.31, 4.0.32, 4.0.33, 4.0.34, 4.0.35, 4.0.36, 4.0.37, 4.0.38, 4.0.40, 4.0.41, 4.0.42, 4.0.43, 4.0.44, 4.0.45, 4.0.47, 4.0.48, 4.0.49, 4.0.5, 4.0.50, 4.0.51, 4.0.52, 4.0.53, 4.0.54, 4.0.55, 4.0.56, 4.0.57, 4.0.58, 4.0.59, 4.0.6, 4.0.60, 4.0.61, 4.0.62, 4.0.7, 4.0.8, 4.0.9, v4.0.46
View affected-version evidence
{
"ranges": [
{
"events": [
{
"introduced": "0"
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"fixed": "4.0.63"
}
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"v4.0.46"
]
}