Vulnerability · Published Aug 16, 2021 · Assigned by GitHub_M

CVE-2021-32825ZipSlip vulnerability in bblfshd

Low 2.7

In plain English

A low-severity security flaw in bblfshd from bblfsh. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities).

Severity (CVSS 3.1)2.7Low

Exploit odds (30 days)0.9%top 39.6% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

bblfshd is an open source self-hosted server for source code parsing. In bblfshd before commit 4265465b9b6fb5663c30ee43806126012066aad4 there is a "zipslip" vulnerability. The unsafe handling of symbolic links in an unpacking routine may enable attackers to read and/or write to arbitrary locations outside the designated target folder. This issue may lead to arbitrary file write (with same permissions as the program running the unpack operation) if the attacker can control the archive file. Additionally, if the attacker has read access to the unpacked files, he may be able to read arbitrary system files the parent process has permissions to read. For more details including a PoC see the referenced GHSL-2020-258.

Affected products (as reported)

Vendor	Product	Versions
bblfsh	bblfshd	< 4265465b9b6fb5663c30ee43806126012066aad4

Weakness: CWE-23 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N

References

https://securitylab.github.com/advisories/GHSL-2020-258-zipslip-bblfshd/ x_refsource_CONFIRM
https://github.com/bblfsh/bblfshd/pull/341 x_refsource_MISC
https://github.com/bblfsh/bblfshd/commit/4265465b9b6fb5663c30ee43806126012066aad4 x_refsource_MISC