CVE-2021-34548

An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-003. An attacker can forge RELAY_END or RELAY_RESOLVED to bypass the intended access control for ending a stream.

An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-003. An attacker can forge RELAY_END or RELAY_RESOLVED to bypass the intended access control for ending a stream.

Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell on half-closed streams. Previously, clients failed to validate which hop sent these cells: this would allow a relay on a circuit to end a stream that wasn't actually built with it (CVE-2021-34548).

hashtable-based CPU denial-of-service attack against relays (CVE-2021-34549).

out-of-bounds memory access in v3 onion service descriptor parsing (CVE-2021-34550).

See also upstream release notes for included other bugfixes.

This package also fixes an error in tor package's un-install script (mga#29158).

This update for tor fixes the following issues:

tor 0.4.5.9

• Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell (CVE-2021-34548, boo#1187322)
• Detect more failure conditions from the OpenSSL RNG code (boo#1187323)
• Resist a hashtable-based CPU denial-of-service attack against relays (CVE-2021-34549, boo#1187324)
• Fix an out-of-bounds memory access in v3 onion service descriptor parsing (CVE-2021-34550, boo#1187325)

tor 0.4.5.8

• https://lists.torproject.org/pipermail/tor-announce/2021-May/000219.html
• allow Linux sandbox with Glibc 2.33
• work with autoconf 2.70+
• several other minor features and bugfixes (see announcement)

• Fix logging issue due to systemd picking up stdout - boo#1181244 Continue to log notices to syslog by default.

This update for tor fixes the following issues:

tor 0.4.5.9

• Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell (CVE-2021-34548, boo#1187322)
• Detect more failure conditions from the OpenSSL RNG code (boo#1187323)
• Resist a hashtable-based CPU denial-of-service attack against relays (CVE-2021-34549, boo#1187324)
• Fix an out-of-bounds memory access in v3 onion service descriptor parsing (CVE-2021-34550, boo#1187325)

tor 0.4.5.8

• https://lists.torproject.org/pipermail/tor-announce/2021-May/000219.html
• allow Linux sandbox with Glibc 2.33
• work with autoconf 2.70+
• several other minor features and bugfixes (see announcement)

• Fix logging issue due to systemd picking up stdout - boo#1181244 Continue to log notices to syslog by default.

This update was imported from the openSUSE:Leap:15.2:Update update project.

These are all security issues fixed in the tor-0.4.6.7-2.2 package on the GA media of openSUSE Tumbleweed.

It was discovered that Tor incorrectly handled certain memory operations. A remote attacker could use this issue to cause a denial of service. This issue only affected Ubuntu 18.04 ESM. (CVE-2019-8955)

It was discovered that Tor did not properly handle the input length to dump_desc() function. A remote attacker could use this issue to cause a denial of service. This issue only affected Ubuntu 16.04 ESM, Ubuntu 18.04 ESM and Ubuntu 20.04 ESM. (CVE-2021-28089)

It was discovered that Tor did not properly sanitize the relay nickname in dirvote_add_signatures_to_pending_consensus() function. An attacker could possibly use this issue to cause an assertion failure and then cause a denial of service. (CVE-2021-28090)

It was discovered that Tor did not properly validate the layer hint on half-open streams. A remote attacker could possibly use this issue to bypass the access control, leading to remote code execution. This issue only affected Ubuntu 20.04 ESM. (CVE-2021-34548)

It was discovered that Tor was using an insecure hash function. A remote attacker could use this issue to cause a denial of service. This issue only affected Ubuntu 16.04 ESM, Ubuntu 18.04 ESM and Ubuntu 20.04 ESM. (CVE-2021-34549)

It was discovered that Tor did not properly manage memory under certain circumstances. If a user were tricked into opening a specially crafted request, a remote attacker could possibly use this issue to cause a crash, resulting in a denial of service, or possibly reading sensitive data. This issue only affected Ubuntu 18.04 ESM and Ubuntu 20.04 ESM. (CVE-2021-34550)

It was discovered that Tor mishandles the relationship between batch-signature verification and single-signature verification. An attacker could possibly use this issue to cause an assertion failure and then cause a denial of service. This issue only affected Ubuntu 16.04 ESM, Ubuntu 18.04 ESM and Ubuntu 20.04 ESM. (CVE-2021-38385)