CVE-2021-32557: canonical apport Link Following
CVSS: 7.1v3.1HighModified
AliasesUBUNTU-CVE-2021-32557
Published 12-06-2021Last modified 16-09-2024
Vulnerability summary
CVE-2021-32557 is a high (CVSS 7.1) Link Following vulnerability in canonical apport. EPSS estimates a 0.39% chance of exploitation in the next 30 days, higher than 31.6% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
7.1/10
010
High · v3.1 (NVD)EPSS score
0.39%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Advisory lineage
Upstream 0 · Downstream 2 · Related 2Timeline
- 12-06-2021PublishedVulnerability first disclosed.
- 16-09-2024Last modifiedVulnerability information updated.
Description
It was discovered that the process_report() function in data/whoopsie-upload-all allowed arbitrary file writes via symlinks.
CVSS metrics
4 scores · 3 sources · 2 versionsHigh 7.1Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:HSources3 sources · 5.2–7.1
- CVE.orgCNA5.2MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:LDiffers
- OSV · UbuntuEcosystem advisory · calculated5.2MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:LDiffers
Low 3.6Preferred score · NVD (NIST)
AV:L/AC:L/Au:N/C:N/I:P/A:PSourcesSingle source
EPSS trend
Probability
0.39%
Chance of exploitation in the next 30 days
Percentile
32%
Versus all other CVEs
30-day change
0.00 pp
From 0.39% on 19-09-2026
19-09-202619-10-2026
EPSS score0.39%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (bugs.launchpad.net)
Maturity: unknown
Weaknesses
CWE · root cause- CWE-59Improper Link Resolution Before File Access ('Link Following')The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
- CWE-61UNIX Symbolic Link (Symlink) FollowingThe product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files.
Affected systems
Canonical1 product
- apport≥ 2.14.1-0ubuntu3, < 2.14.1-0ubuntu3.29\+esm7 | ≥ 2.20.1, < 2.20.1-0ubuntu2.30\+esm1 | ≥ 2.20.9, < 2.20.9-0ubuntu7.24 | ≥ 2.20.11-0ubuntu27, < 2.20.11-0ubuntu27.18 | ≥ 2.20.11-0ubuntu50, < 2.20.11-0ubuntu50.7 | ≥ 2.20.11-0ubuntu65, < 2.20.11-0ubuntu65.1
Ubuntu1 product
- apport< 2.14.1-0ubuntu3.29+esm7 | < 2.20.1-0ubuntu2.30+esm1 | < 2.20.9-0ubuntu7.24 | < 2.20.11-0ubuntu27.18
2 vendors · 2 products